People's Crusade
In 1096, the People's Crusade swept through the Lorraine, murdering 12,000 Jews and uprooting whole communities. Among those murdered in Worms were the three sons of Rabbi Isaac ben Eliezer Halevi, Rashi's teacher. Rashi wrote several "Selichot" (penitential poems) mourning the slaughter and the destruction of the region's great yeshivot. Seven of Rashi's "Selichot" still exist, including "Adonai Elohei Hatz'vaot"", which is recited on the eve of Rosh Hashanah, and "Az Terem Nimtehu", which is recited on the Fast of Gedalia.