Soga clan
He succeeded his great aunt, Empress Suiko. Suiko did not make it clear who was to succeed her after her death. Before her death, she called Tamura and Prince Shōtoku's son, Prince Yamashiro-no-Ōe, and gave some brief advice to each of them. After her death the court was divided into two factions, each supporting one of the princes for the throne. Soga no Emishi, the head of Soga clan, supported Tamura. He claimed that Empress Suiko's last words suggested her desire that Tamura succeed her to the throne. Prince Yamashiro-no-Ōe was later attacked by the Soga clan and committed suicide along with his entire family.