Rabbi Aharon from the seed of the Nesi'im who came from Barcelona to Tulitila in the year 5043, as is evident from Sefer Yesod Olam. And the Yuchsin says he died in the year 5053, and perhaps this is he who authored Sefer HaChinuch [(Shomer HaDat, letter 56, section 2)] and is called the Ra"h, and the Rashba wrote in his responsa that the Ra"h was his teacher, and there is another Ra"h, [(Shomer HaDat, letter 58, section 2)]:

Rabbi Shem Tov of Leon authored Sefer HaMishkal [(for composing poems and verses)] and Mishkan HaEdut [(so I saw)] and other books. [And at the end of the introduction in the commentary of Rabbi Yehudah Chayyat on Sefer Ma'arekhet Elohut, he praises his books very highly, and criticizes his chatterings, (Yuchsin in the generations of the Acharonim). Rashat of London authored Mizbach HaZahav, philosophy...]