Isaac de Leon יצחק די לאון
(c.1420 - c.1490 CE) (1420 - 1490 לספירה בקירוב)
Isaac de Leon, (born in Toledo - not to be confused with Isaac Leon ibn Tzur, author of Megilat Esther on Rambam), a Kabbalist and author of Maʿaseh Nissim, was a native of Leon, and the pupil of Isaac Campanton. He was part of the Kabbalistic circles that produce the work "Sefer Ha-Meshiv". An opponent of philosophy, he nonetheless studied Aristotelian logic as part of the formal approach to halakhah of the school of Isaac Campanton. Joseph Karo and others honored him with the title of "the great teacher." He was more than seventy years of age at his death, which occurred shortly before the expulsion of the Jews from Spain.