Mustafa was supported by Ibrahim Pasha, who became Suleiman's grand vizier in 1523. Hurrem has usually been held at least partly responsible for the intrigues in nominating a successor. Although she was Suleiman's wife, she exercised no official public role. This did not, however, prevent Hurrem from wielding powerful political influence. Since the empire lacked, until the reign of Ahmed I (1603–1617), any formal means of nominating a successor, successions usually involved the death of competing princes in order to avert civil unrest and rebellions. In attempting to avoid the execution of her sons, Hurrem used her influence to eliminate those who supported Mustafa's accession to the throne.