Today is the 1086th death anniversity of Mansur Hallaj.
Mansur Hallaj (c. 858 - March 26, 922) was a Persian mystic, writer and teacher of Sufism most famous for his apparent, but disputed, self-proclaimed divinity, his poetry and for his execution for heresy after a long, drawn-out investigation.
He became famous because of his controversial statement: "I am The Truth", which was taken to mean that he was claiming to be God. While many Sufis theorize that Hallaj was a reflection of God's truth in much the same way Christians view Jesus, scholars of the well-established Islamic schools of thought continue to see him as a heretic and a deviant.
Rumi wrote on the claim "I am God" three centuries later:
People imagine that it is a presumptive claim, whereas it is really a presumptive claim to say "I am the slave of God"; and "I am God" is an expression of great humility. The man who says "I am the slave of God" affirms two existences, his own and God's, but he that says "I am God" has made himself non-existent and has given himself up and says "I am God", that is, "I am naught, He is all; there is no being but God's." This is the extreme of humility and self-abasement.