Sefer Yereim

Reb Aryeh Leib, the author of the Shaagas Aryeh, was one of the great minds of all times. His genius led him to be very impatient with people, especially with communal leaders who were not worthy of their exalted positions. Because of this he was seldom able to remain as rav in one town for very long, and spent much of his life wandering from city to city, in great poverty.