Moshe Chaim Luzzatto ( משה חיים לוצאטו, also Moses Chaim, Moses Hayyim, also Luzzato) (1707, Padua – 18 May 1746, Acre (26 Iyar 5506)), also known by the Hebrew acronym RaMCHaL (or RaMHaL, רמח"ל), was a prominent Italian Jewish rabbi, kabbalist, and philosopher.

Born in Padua at night, he received classical Jewish and Italian educations, showing a predilection for literature at a very early age. He may have attended the University of Padua and certainly associated with a group of students there, known to dabble in mysticism and alchemy. With his vast knowledge in religious lore, the arts, and science, he quickly became the dominant figure in that group. His writings demonstrate mastery of the Tanakh, the Talmud, and the rabbinical commentaries and codes of Jewish law.

The turning point in Luzzatto's life came at the age of twenty, when he received direct instruction from a mystical being known as the maggid. While such stories were not unknown in kabbalistic circles, it was unheard of for someone of such a young age. His peers were enthralled by his written accounts of these "Divine lessons", but the leading Italian rabbinical authorities were highly suspicious and threatened to excommunicate him.

Just one hundred years earlier another young mystic, Shabbatai Zvi (d.1676), had rocked the Jewish world by claiming to be the Messiah. Although, at one point, Zvi had convinced many European and Middle Eastern rabbis of his claim, the episode ended with him recanting and converting to Islam. The global Jewish community was still reeling from that, and the similarities between Luzzatto's writings and Zvi's were perceived as being particularly dangerous and heretical.

These writings, only some of which have survived, are often misunderstood to describe a belief that the Ramchal and his followers were key figures in a messianic drama that was about to take place. He identified one of his followers as the Messiah son of David, but assumed for himself the role of Moses, claiming that he was that biblical figure's reincarnation. Continued