The Prince of Tver (Russian: Князь тверской) was the ruler of the Principality of Tver. The princes of Tver descended from the first prince, Yaroslav Yaroslavich (r. 1247–1271).[1][2] They are also known as the "Iaroslavichi" or "Yaroslavichi of Tver",[3] or the "Mikhailovichi of Tver".[4] In 1485, Tver was formally annexed by Moscow and became an appanage.