These are Three Gedolei Olam whose Yahrtzeit is celebrated today, the 30th of Nissan.
1. Rabbenu Chaim Vital, Zy"a a Talmid Muvhak of the Holy Alshich Zy"a, And Talmid of the Holy Ar"i Zy"a.
2. Karbon Nesanel Zt"l - HaRav Nesanel Weil. He was a Rosh Yeshiva in Prague.
3. Rabbenu Yaakov Emden Zt"l. He was the son of the Chacham Tzvi. He lived in Altuna then he went to Emden. After 4 years he returned to Altuna. He left again to Amsterdam for a year and a half. He returned to Altuna where he was Niftar and buried.