Joseph Karo

Why this Chapter exists

The man who put Jewish law on one page.

In the year 1500, the rules of Jewish religious law were scattered across a thousand years of debate, in dozens of books that often disagreed with each other. Answering a simple question took a scholar with a wall of volumes. Joseph Karo (1488–1575) gathered that legal discussion into a single practical code, the Shulchan Aruch. Rabbis and communities could consult it without tracing each ruling back through the whole legal tradition. It remains the standard reference for traditional Jewish practice today.

Karo’s code is often studied alongside the work of Rashi, the eleventh-century French commentator, and Maimonides, the twelfth-century codifier of Jewish law. Karo lived later, in the sixteenth century, and his life began with the expulsion of the Jews from Spain in 1492.

Object Spotlight

A set table and a tablecloth.

Karo’s own book kept the Tur’s four-part structure and cut the law down to short, numbered rulings, one after another: do this, not that, on these days, in this order. It left out the long arguments and gave the bottom line. He organized centuries of legal discussion into a practical code that could serve as a common reference for Jewish communities across the diaspora, the Jewish world scattered outside the Land of Israel. Its rulings were short enough for a student to memorize.

The book is the Shulchan Aruch, Hebrew for “the Set Table.” Karo completed it in the 1550s, and it was first printed in Venice, Italy, in 1565. The name explains the idea: a meal laid out and ready, so the reader does not have to cook or know the recipe.

The book had a gap. Karo was Sephardic, from the Jewish world of Spain and the Mediterranean, and he had built his rulings mostly on Sephardic authorities. So his “set table” quietly served Sephardic food. Jews in central and eastern Europe, the Ashkenazi world, followed some customs differently, and Karo’s text left their customs out.

The answer came from Poland. Moses Isserles, instead of writing a rival book, wrote notes adding the Ashkenazi practice wherever it differed. He named them the Mappah, “the Tablecloth,” for Karo’s Set Table. The result was one page a Sephardic reader and an Ashkenazi reader could both follow, each finding their own practice on it.

More than 450 years later, the combined book, Karo’s table plus Isserles’s cloth, is still studied by rabbis, students, and observant Jews as a first reference for questions of practice. A refugee from Spain and a rabbi of Kraków share one page.

Iberia and the 1492 expulsion

Expelled as a child.

Joseph ben Ephraim Karo was born in 1488, into the Jewish community of Spain. (The exact place is uncertain. Tradition says Toledo, in Castile, in central Spain. Some scholars argue for Portugal or elsewhere on the Iberian Peninsula, the landmass that is today Spain and Portugal.) His family belonged to the Sephardic world, the long-established Jewish society of medieval Spain.

When Karo was about four years old, that world was broken up. On March 31, 1492, King Ferdinand and Queen Isabella, the same monarchs who that year sent Columbus across the Atlantic, signed the Alhambra Decree, ordering every Jew out of their kingdoms. Convert to Christianity or leave, within about four months. How many Jews left Spain that summer is still debated by historians. The expulsion ended more than a thousand years of open Jewish life there. (Those who converted were called Conversos. Some kept practicing Judaism in secret. The Spanish Inquisition put them on trial, used torture, and had many of those it condemned burned at the stake.)

Karo’s family seems to have been among those who left. They went first to Portugal, until Portugal forced its own Jews to convert in 1497, and then kept moving east, to the Ottoman Empire, the Muslim empire then centered in what is now Turkey, which admitted the refugees. Later Jewish chroniclers have its sultan, Bayezid II, marveling that Spain would impoverish itself by throwing out its skilled and educated subjects, whom he would happily take in.

The Ottoman wanderings · 1497–1536

Forty years of wandering.

For about the next four decades, Karo lived the life of the Ottoman Sephardic diaspora, moving from city to city across the empire’s lands, studying and teaching in one refugee community after another. The stops the record names:

• Nikopol, in what is now Bulgaria, where the young Karo got his first rabbinic schooling from his father and the local Sephardic community.
• Adrianople and Constantinople (today Edirne and Istanbul, in Turkey), the great centers of Ottoman Sephardic life. Karo met Solomon Molcho (c. 1500–1532), who was born into a family of forced converts in Portugal, returned openly to Judaism, and took up a mystical, messianic mission. The Inquisition burned Molcho at the stake in Italy in 1532. His death marked Karo deeply. In Karo’s private visionary diary (described below), the voice that spoke to him repeatedly promised him a martyr’s death by fire, the death Molcho had died. Karo lived to eighty-seven.
• Salonika (today Thessaloniki, in Greece), home to one of the largest Jewish communities in the Ottoman Empire, most of it Sephardic. Here Karo went deeper into both law and Kabbalah, the Jewish mystical tradition.

Through these years of moving and teaching, he was writing one enormous book. By his own account he began it in 1522, at about thirty-four, and worked at it for twenty years, city after city, before it was done.

Safed · 1536–1575

The hilltop town.

Around 1536, Karo went to Safed (in Hebrew, Tzfat): a town high in the hills of the Galilee, in the north of the Land of Israel. In the sixteenth century this small mountain town became, for a few generations, a leading center of Jewish law and mysticism, drawing scholars and mystics from across the Jewish world. Karo spent the last thirty-nine years of his life there and became one of its leaders.

In Safed he ran a major academy, trained students who became leading rabbis in their own right, and served as head of the town’s religious court. He also took part in a controversial experiment in 1538. Rabbi Jacob Berab of Safed tried to revive semikhah, the original chain of rabbinic ordination that traced back to the ancient Sanhedrin (the supreme Jewish court of antiquity) and had been broken for over a thousand years. Berab ordained Karo among the first. The effort drew sharp opposition and failed. Karo later tried to ordain his own student Moses Alshekh but gave up in the face of the same opposition.

Karo died in Safed on March 24, 1575, at the age of eighty-seven, and was buried in the town’s old cemetery, near other scholars and mystics of sixteenth-century Safed. His grave is still visited today.

The Beit Yosef · 1522–1542

The twenty-year book.

The short rulebook grew out of a giant one. For twenty years, from 1522 to 1542, through the wandering and into his first years in Safed, Karo wrote the Beit Yosef, “the House of Joseph.” It is a vast commentary on the Tur, the fourteenth-century law code of Jacob ben Asher. For each ruling, Karo traces the answer back through centuries of debate to its root in the Talmud, the foundational record of Jewish law and debate, and shows the chain of reasoning.

Writing it forced him to settle a problem: the medieval authorities often disagreed. Karo set a rule for deciding between them. He chose three leading medieval authorities, and where two of the three agreed, that was the law. The rule had a built-in tilt. Two of the three came from the Sephardic, Mediterranean world: the Rif (Isaac Alfasi, 1013–1103, of North Africa and Spain) and the Rambam (Maimonides). Where they agreed they outvoted the third, the Rosh (Asher ben Jehiel, c. 1250–1327), a German-born authority who had moved to Toledo. So when Karo later distilled this giant work into his short rulebook, the rulebook leaned Sephardic.

Alongside it Karo wrote the Kesef Mishneh, a commentary on Maimonides’ code of Jewish law, the Mishneh Torah. It is still printed beside that code in standard editions.

The Shulchan Aruch · 1565

The Set Table.

The Beit Yosef was the scholar’s version, too big for daily use. So Karo took its practical conclusions and stripped them down to the essentials: short, flat statements of what to do, with all the argument removed. He wrote it in the mid-1550s, and it was printed in Venice in 1565 as the Shulchan Aruch, “the Set Table.” It is organized into four parts covering the whole of Jewish practice:

• Orach Chayim (“Way of Life”): daily life, prayer, the Sabbath, and the festivals.
• Yoreh De’ah (“Teaching Knowledge”): what is permitted and forbidden, including the dietary laws (kashrut), mourning, and conversion.
• Even ha-Ezer (“Stone of Help”): marriage, divorce, and family law.
• Choshen Mishpat (“Breastplate of Judgment”): civil and business law: property, contracts, courts.

Karo’s own goal was modest. He wrote in the introduction that the book was a study aid for young students. It was short enough for them to review regularly and commit to memory, so they would know Jewish law without a library at their elbow. In practice, the Shulchan Aruch became the main reference for Jewish practice across the Jewish world. Some scholars objected, among them Solomon Luria and the Maharal of Prague, who distrusted a code stripped of its reasoning. Its standing became secure only after the next century’s commentaries had grown around it.

Moses Isserles and the Mappah

The Tablecloth.

The problem surfaced the moment the book appeared. Jews in Ashkenaz (central and eastern Europe) differed in many practices from the Sephardic world, and Karo’s Sephardic-leaning rulings left their customs out. To an Ashkenazi reader, the “set table” was serving the wrong meal.

The answer came from Rabbi Moses Isserles (known as the Rema, c. 1525–1572) of Kraków, in Poland, a leading Ashkenazi legal authority of the day. Isserles had been writing his own law code when Karo’s appeared. Instead of publishing a rival, he wrote a set of notes to Karo’s book, adding the Ashkenazi practice wherever it differed. He called his additions the Mappah (“the Tablecloth”), playing directly on Karo’s “Set Table.”

From the first Kraków printings on, the two were printed as one. A Sephardic reader follows Karo’s main text, and an Ashkenazi reader follows Isserles’s notes where they differ. With that, a single book served both Sephardic and Ashkenazi Jews, each finding their own practice on the same page.

The Maggid Mesharim

The secret diary.

Karo also had a private, mystical side. For decades he kept a diary, parts of which were published after his death as the Maggid Mesharim. (A maggid is a heavenly teacher or messenger.) In it he records a voice that came to him in moments of deep concentration. He understood it as a heavenly mentor (the living spirit of the Mishnah, the early core of the Talmud) speaking to him directly. The voice praised his legal work, scolded his failings, and pressed him on how he lived.

It is a rare first-person account of mystical experience from the period. The standard study, R. J. Zwi Werblowsky’s Joseph Karo: Lawyer and Mystic (Oxford, 1962), treats the lawyer and the mystic as one person. In sixteenth-century Safed, many scholars combined the study of law with Kabbalah, the Jewish mystical tradition.

The question of authority

Why this book won.

Earlier scholars, Maimonides among them, had written sweeping codes that shaped Jewish life without becoming a single accepted reference across communities. Karo’s code, with Isserles’s notes, did. Scholars, among them Isadore Twersky, point to a few reasons:

• It served both traditions. The Karo-plus-Isserles design served Sephardic and Ashkenazi readers on the same page.
• It arrived with the printing press. The Shulchan Aruch appeared when Hebrew printing was well established. The Tur and the Mishneh Torah had been in print for most of a century. One combined edition, Karo with Isserles, could become the same book everywhere at once.
• It came when it was needed. The mid-1500s were a time of rebuilding after the expulsions from Spain and Portugal, when scattered communities needed a common reference.
• Later scholars built on it. A tradition of commentary grew up around the Shulchan Aruch, printed in the margins around Karo’s text. It kept the code part of the ongoing debate of Jewish law.

Reception across communities

Who follows it.

• Sephardic and Mizrahi Jews (the Jews of the Middle East and North Africa), across the Ottoman world, North Africa, and the wider Sephardic diaspora, took Karo’s main text as their standard. Later Sephardic authorities worked within his framework.
• Ashkenazi Jews, across central and eastern Europe, followed Isserles’s notes, and the later Ashkenazi tradition built on his additions.
• Yemenite Jews are the notable exception: many held to the older tradition of Maimonides rather than adopting the Shulchan Aruch.
• Today, the Shulchan Aruch remains the working reference for traditional Jewish practice, central in Orthodox life and engaged seriously across the other movements.

Sites that survive

Where the record stands.

• Safed (Tzfat), Israel, the tomb of Joseph Karo, in the old cemetery of the Galilee hill town, near the graves of other scholars and mystics of sixteenth-century Safed, and still visited today.
• Safed, the Karo Synagogue. A synagogue in the old city named for Karo, tied by tradition to his presence there, rebuilt over the centuries and active in Safed’s historic Jewish quarter.

Classroom Connections

Where this Chapter fits.

Teaching Connections

• World History. Karo’s life and work sit within the early modern Mediterranean, the 1492 Spanish expulsion, the Ottoman Empire as a refuge, the community of Safed, and the printing revolution that carried his code across the diaspora.
• Classroom Applications. Students can:
  • analyze a legal code and its commentary as primary sources
  • trace how the printing revolution carried one code across the Sephardi and Ashkenazi worlds
  • connect Karo’s Safed to the post-1492 Sephardic dispersion
  • examine how a shared text can unify a dispersed community
  • construct evidence-based historical arguments.
• International Classroom Relevance. Because the Shulchan Aruch shaped Jewish practice across the Sephardi and Ashkenazi worlds, this Chapter supports world history, religious studies, and the history of law and print culture internationally.

Standards Alignment

• NYS Social Studies Framework: NY Global History 9.7 (The Ottoman Empire and the Ming Dynasty Pre-1600). For grades 7–8, anchored through Common Core literacy and interdisciplinary humanities.
• Common Core RH.6–8, RH.9–10 & RH.11–12. Students assess an author’s purpose and point of view (RH.6–8.6, RH.9–10.6, RH.11–12.6) and corroborate evidence across sources (RH.6–8.9, RH.9–10.9, RH.11–12.9), working from the Shulchan Aruch itself, its commentaries (including Moses Isserles’s Mappah), and modern scholarship.
• C3 Framework, D2.His.1 and D2.His.14 (grades 6–8 and 9–12). Students investigate historical context, continuity and change, and causation.