Qutb ad-Dīn Haydar
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Qutb ad-Dīn Haydar is a Persian Sufi saint, who died about 1221 CE/618 AH. Haydar - the Persian form of his name is Heydar - founded an order of mendicant dervishes known as the Haydariyya known for their celibacy and self-mortification through piercing their own bodies with iron rings.
He is also known by Heyder.