Aaron of Canterbury was an English

History of the Jews in England

The history of the Jews in England goes back to the reign of William I. The first written record of Jewish settlement in England dates from 1070, although Jews may have lived there since Roman times...

 rabbi

Rabbi

In Judaism, a rabbi is a teacher of Torah. This title derives from the Hebrew word רבי , meaning "My Master" , which is the way a student would address a master of Torah...

 and halakhic

Halakha

Halakha — also transliterated Halocho , or Halacha — is the collective body of Jewish law, including biblical law and later talmudic and rabbinic law, as well as customs and traditions.Judaism classically draws no distinction in its laws between religious and ostensibly non-religious life; Jewish...

 exegete, mentioned in Minhat Yehudah ("The Offering of Judah") by Judah ben Eliezer on Deuteronomy

Deuteronomy

The Book of Deuteronomy is the fifth book of the Hebrew Bible, and of the Jewish Torah/Pentateuch...

 xxvi.2, in association with Rashi

Rashi

Shlomo Yitzhaki , or in Latin Salomon Isaacides, and today generally known by the acronym Rashi , was a medieval French rabbi famed as the author of a comprehensive commentary on the Talmud, as well as a comprehensive commentary on the Tanakh...

 and Rabbi Jacob of Orleans

Jacob of Orléans

Jacob of Orléans was a noted Jewish scholar, considered by many to be one of the most learned men of his age. Jacob was a tosafist in Orléans, France, who studied under Rabbenu Tam. He remained in Orléans until at least 1171, leaving at a later date to go to London, most likely to become a teacher...

, and thus, seemingly, of the twelfth century. But a passage in the Close Roll

Close Roll

The Close Roll is the administrative record created by the medieval office of the chancery that recorded all the letters close issued by the chancery. In the medieval Kingdom of England, the first Close Roll was started in 1204 under the Chancellorship of Hubert Walter...

of 1242 refers the decision in a divorce case to three "magistri," Mosse of London, Aaron of Canterbury, and Jacob of Oxford, and makes it probable that the Aaron mentioned in "Minhat Yehudah" was of the thirteenth century and acted as an ecclesiastical assessor, or dayyan

Dayyán

Mirza Asadullah-i-Khuy , often referred to as Dayyán, was a Babi follower, a religion founded by the Báb in Persia in the mid 1850s. The Báb wrote numerous tablets of praise to Dayyán recognising his devotion to the new religion...

, in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

about 1242. If so, his name was Aaron fil (son of) Samson.