تیشتر

Tishtrya (; ) is the Avestan name of a Zoroastrian benevolent divinity associated with life-bringing rainfall and fertility. Tishtrya is Tir in Middle- and Modern Persian. As has been judged from the archaic context in which Tishtrya appears in the texts of the Avesta, this divinity is almost certainly of Indo-Iranian origin. Tir is associated with the star Sirius, called Tishtar, in Modern Persian.