[6] He was the grandson of Petru Rareș,[15] younger brother of Ieremia Movilă,[9][13] and father of Petro Mohyla, who became the Metropolitan of Kiev, Halych and All-Rus'[a] from 1633 until his death, and later was canonized as a saint in the Russian, Romanian and Polish Orthodox Churches.

[20] In August 1602, Simion was defeated by Radu Șerban and forced into exile to Moldavia.

[4] After the death of his brother Ieremia in July 1606, Simion gained the Moldavian throne.

[citation needed] He died on September 14, 1607, after a reign of only a year and a few months.

His death was suspected to be the result of poisoning,[21] which only further inflamed tensions around succession.