Attar of Nishapur
Attar of Nishapur was a Persian poet and mystic. He was born in Nishapur in ~1146. Information about Attar's life is scarce. Although many of his works burned during Mongol invasion, it is possible to know his character and thoughts by his remained works. Rumi, the Persian poet, has mentioned in one of his poems:
Attar has traversed the seven cities of Love, We are still at the turn of one street.
Attar was killed by mongols during their invasion.