He was born on 26 or 29 Sha'aban 661 AH (July 1263 CE), and died on 6 Shawwal 782 AH (2 January 1381 CE).
These letters were written in 747 AH (1346 CE), directed to one of his important murids Qadi Shamsuddin. His letters are considered a masterpiece in Sufism and Islamic theology.
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