The "Prince of Moscow" refers to the title held by the rulers of the Grand Duchy of Moscow, which later became the Tsardom of Russia. This title emerged in the late 13th century and was significant in unifying various Russian principalities. The princes played a crucial role in expanding Moscow's influence and territory, ultimately leading to the establishment of a centralized Russian state. One of the most notable figures was Ivan III, also known as Ivan the Great, who reigned from 1462 to 1505. He successfully consolidated power, defeated the Golden Horde, and laid the groundwork for the future Russian Empire. His reign marked a pivotal moment in Russian history, transitioning from fragmented principalities to a unified state.