Avraham ben Nachman Chazan was a Breslover rabbi known for his extreme asceticism. The son of a close disciple of R. Natan of Nemirov (Rebbe Nachman's amanuensis), Avraham ben Nachman assumed the leadership of the Breslov Chasidic community in Uman after R. Natan's death. After his father's death in 1884, he began committing to writing many of Breslov's oral traditions, ultimately publishing them in his work Kokhvei Or. In 1894, he moved to Jerusalem but returned to Uman in Ukraine annually for the gathering of Breslov Chasidim at the grave of Rebbe Nachman on Rosh Hashanah. One journey took him to Radzin, where, as result of his meeting with R. Gershon Henech Leiner (Ba'al HaTekhelet), some Breslov Chasidim began putting tekhelet (blue strands) on their tzitzit. During his trip to Uman in 1914, World War I broke out, and he was forced to remain in Russia, where he remained until his death.