Abu Saeed Al-Khair was born in village Khawaran of Khorasan (presently at Iran) on 7 December 967 BC (year of grace). His complete name is Sheikh Abu Saeed Fazal Ullah Bin Abu Al-Khair. He belongs to a religious family of Khawaran, Khorasan. Muhammad Bin Munawar was one of his talented nephew, who wrote a book "Israr al Tauheed" on his complete life and character. Abu Saeed was a great religious scholar, mystic and Sufi poet.