Abraham ben David ( – 27 November 1198), also known by the abbreviation RABaD (for Rabbeinu Abraham ben David) Ravad or RABaD III, was a Provençal rabbi, an important commentator on the Talmud, Sefer Halachot of Rabbi Yitzhak Alfasi (known by the abbreviation RIF) and Mishne Torah of Maimonides, and is regarded as a father of Kabbalah and one of the key links in the chain of Jewish mystics. Biography RABaD's maternal grandfather, Rabbi Yitzhak b. Yaakov Ibn Baruch of Mérida (1035–1094), who had compiled astronomical tables for the son of Shemuel ha-Nagid, was one of five rabbis in Spain renowned for their learning. Concerning the oral history of his maternal grandfather's family and how they came to Spain, the RABaD wrote: "When Titus prevailed over Jerusalem, his officer who was appointed over Hispania appeased him, requesting that he send to him captives made-up of the nobles of Jerusalem, and so he sent a few of them to him, and there were amongst them those who made curtains and who were knowledgeable in the work of silk, and [one] whose name was Baruch, and they remained in Mérida." RABaD was born in Provence, France, and died at Posquières. He was the son-in-law of Abraham ben Isaac of Narbonne Av Beth Din (known as the RABaD II). He was the father of R' Isaac the Blind, a Neoplatonist and important Jewish mystical thinker. The teachers under whose guidance he acquired most of his Talmudic learning were R' Moses ben Joseph and R' Meshullam ben Jacob of Lunel. RABaD remained in Lunel after completing his studies, and subsequently became one of the city's rabbinical authorities. He went to Montpellier, where he remained for a short time, and then moved to Nîmes, where he lived for a considerable period. R' Moses ben Judah refers to the rabbinical school of Nîmes, then under RABaD's direction, as the chief seat of Talmudic learning in Provence. The centre of the RABaD's activity was Posquières, after which place he is often called. The town is known as Vauvert today. It is difficult to determine when he moved to Posquières; but about 1165, Benjamin of Tudela, at the outset of his travels, called upon him there. He spoke of the Ravad's wealth and benevolence. Not only did he erect and keep in repair a large school-building, but he also cared for the material welfare of the poor students.