Alexander Suslin, ha-Kohen, of Frankfurt, -1349

Alexander Suslin (or Alexander Süsslein) HaKohen (died 1349) was a prominent 14th century rabbinic authority born in Erfurt, Germany, and one of the most important Talmudists of his time. He was rabbi first in Cologne and Worms, and then moved to Frankfort-on-the-Main. He authored Sefer HaAguddah (ספר האגודה, "Book of the Collection"), a halakhic work (structured by the order of the Talmud's tractates) which was highly regarded by later rabbinic authorities. He was killed in the Erfurt massacre of 1349 during the Black Death era massacres of hundreds of Jewish communities throughout Europe.