Tag Archives: Kabbalah

Jew of the Week: Isaac Judaeus

The Caliph’s Doctor and the Father of Kabbalah

A 13th-century illustration of Isaac Israeli from a Latin translation of his “Book of Fevers”

Itzhak ben Shlomo (c. 832-932) was born to a religious Jewish family in Egypt. He became renowned as the greatest physician in the country, and in 904 was hired by Prince Ziyadat Allah III. Several years later, he became court physician to Caliph Al-Mahdi Billah of the Fatimid Dynasty, based in Kairouan, Tunisia. Recognizing his immense wisdom, the Caliph made Itzhak (known in Arabic as “Abu Yaqub Ishaq ibn Suleiman al-Israili”, and in Europe as “Isaac Judaeus”) his leading advisor and tutor. Itzhak wrote numerous medical, astronomical, and mathematical treatises which transformed the scientific knowledge of the day. For instance, he is the first person in history to mention performing a tracheostomy. His works were widely distributed for centuries afterwards, and made up much of the medical curriculum of the Middle Ages. Itzhak was also a great philosopher, kabbalist, and mystic. He fused together Greek Neoplatonism with traditional Jewish mysticism, paving the way for the forthcoming explosion of Kabbalistic texts and Jewish mystical circles. His main disciple, Dunash ibn Tamim, wrote a profound commentary on Sefer Yetzirah, the most ancient of Kabbalistic texts. In addition to inspiring many rabbis, he was studied and quoted by great non-Jewish scholars like Thomas Aquinas and Roger Bacon. Among his many other writings is a deeply philosophical commentary on Genesis. In his day, Isaac Judaeus was the world’s leading sage, doctor, and scientist, and Arabic texts of the time refer to him as “master of the seven sciences” and “more valuable than gems”.

Why Did Muslims Rule the Holy Land for 1300 Years?

Words of the Week

We do not have to accept theories as certainties, no matter how widely accepted, for they are like blossoms that fade. Very soon science will be developed further and all of today’s new theories will be derided and scorned and the well-respected wisdom of our day will seem small-minded.
– Rav Kook, First Ashkenazi Chief Rabbi of Israel

Jew of the Week: Abraham Zacuto

The Rabbi Who Saved Columbus

A page from Zacuto’s astronomical tables

Avraham ben Shmuel Zacut “Zacuto” (1452-1515) was born in Salamanca, in what is today Spain, to a religious Sephardic Jewish family. He studied both Jewish law and astronomy, becoming the rabbi of Salamanca and simultaneously an astronomy teacher. He invented a new type of astrolabe and a novel method for determining latitude at sea, which would become vital to navigators and sailors. In 1478, he published HaChibur haGadol, “The Great Book”, with detailed and easy-to-use astronomical tables. It was translated to Spanish in 1481, and Latin shortly after. This made Rabbi Zacuto world-famous and when the Jews of Spain were banished in 1492, he was immediately hired by King John II of Portugal to serve as his royal astronomer. Zacuto argued that a sea route to India was possible, and this convinced John II to finance Vasco da Gama’s famous voyage to discover the route to India, opening European sea trade with the Far East. Da Gama used Zacuto’s astrolabe and tables, and Zacuto personally trained and taught the sailors. Zacuto had also argued, based on the Zohar—the “textbook” of Jewish mysticism, dating back to Rabbi Shimon bar Yochai in the 2nd century CE—that the Earth must be spherical, and it would be possible to journey west, not east. This information was instrumental in convincing Christopher Columbus to launch his own voyage. In fact, Columbus relied heavily on Zacuto’s astrolabe and astronomical charts. In a well-known story from his third voyage, Columbus was marooned on a Caribbean island and facing both hostile natives and his own rebellious sailors. The natives refused to provide food and resources to Columbus, so he came up with a ruse. Consulting Zacuto’s tables, Columbus saw that a lunar eclipse was imminent. He told the native chief that if he will not provide resources to the sailors, the moon would go dark and God would punish them! The eclipse came and the natives panicked, giving Columbus’ men all that they needed to survive. Back in Europe, the next king of Portugal, Manuel I, followed the Spanish in expelling his Jewish subjects. Zacuto was offered to stay in Portugal if only he converted to Christianity, even just nominally. Of course, he refused, and left with his people. He first settled in Tunis, where he wrote his monumental Sefer Yuhasin, a highly-acclaimed work describing the entire history of the Jewish people. He later fulfilled his dream of making it to the Holy Land and lived his last years in Jerusalem. Rabbi Zacuto is considered one of history’s greatest and most consequential astronomers. The Zagut Crater on the moon is named after him.

Happy Lag b’Omer!

The Hidden History of Lag b’Omer

Did the Talmud Predict Today’s Crisis in Israel?

Words of the Week

The blessing in life is when you find the torture you are comfortable with. That’s marriage, it’s kids, it’s work, it’s exercise. Find the torture you’re comfortable with and you’ll do well. You’ve mastered that, you’ve mastered life.
– Jerry Seinfeld

Jew of the Week: Rabbi Yosef Karo

Code of Jewish Law

19th Century Illustration of Rabbi Yosef Karo

Yosef ben Ephraim Karo (1488-1575) was born in Toledo, then in the Spanish kingdom of Castile. The infamous 1492 Spanish Expulsion of the Jews took place when he was just four years old. The family first fled to Portugal, and were then expelled from there as well in 1497. They eventually settled in Nikopolis, in the Ottoman Empire, which had opened its doors to Sephardic Jewish refugees. (The Ottoman Sultan at the time, Bayezid II, reportedly said: “They tell me that Ferdinand of Spain is a wise man, but he is a fool, for he takes his treasure and sends it all to me.”) Karo was tutored by his rabbi father and soon became a rabbi himself. He also studied under the great Rabbi Yosef Taitazak in Salonica. For a couple of years, he served as a rabbi in Adrianople, and eventually resettled in Tzfat. At the time, Tzfat was experiencing a resurgence of Jewish life and a renaissance in Jewish scholarship, thanks mainly to an influx of Sephardic Jewish refugees. It soon became the “capital” of Jewish mysticism, and Rabbi Karo was one of its most famous mystics and scholars. It was in Tzfat that he composed the Shulchan Arukh, to this day the standard code of Jewish law worldwide. (Tzfat boasted one of the first printing presses in the Middle East, helping to spread the Shulchan Arukh far and wide and making it extremely popular and accessible.) The Shulchan Arukh was itself only a summary of the far broader and more complex Beit Yosef, which was Rabbi Karo’s true magnum opus that he worked on for over twenty years. Rabbi Karo opened his own yeshiva, with 200 students including the renowned “Ramak”, Rabbi Moshe Cordovero. Karo also served as the chief rabbi on the Tzfat beit din. In fact, he was one of the main leaders in a rabbinic attempt to re-establish the ancient Sanhedrin. Rabbi Karo was recognized as the preeminent authority for all Sephardic Jewry worldwide, and was deeply respected by Ashkenazi Jews as well who, on several occasions, asked him to intervene in local European disputes. Among his other noted publications are Kesef Mishneh, a commentary on the Mishneh Torah of Maimonides, along with a textbook for Talmudic study. One of his most intriguing works is Maggid Meisharim, a personal journal which records his prophetic experiences and the teachings he received from an angel over a period of fifty years. Rabbi Karo is often referred to simply as Maran, “Our Master”.

Words of the Week

Today, what is demanded of the Jewish people is mesirut nefesh, self-sacrifice, and this is particularly true with regard to chinuch, education. The resources for which we have labored must be dedicated to the education of children – both our own, and the children of others.
– Rabbi Menachem Mendel Schneerson, the Lubavitcher Rebbe