Alexius I of Moscow was a prominent ruler of the Grand Duchy of Moscow who reigned from 1340 to 1359. He is known for consolidating power and expanding the territory of Moscow, which laid the groundwork for the future Russian state. His reign was marked by efforts to strengthen the central authority and reduce the influence of the Tatar khans. During his rule, Alexius I also focused on promoting the Orthodox Church, enhancing its role in society and governance. He was instrumental in fostering a sense of unity among the Russian principalities, which helped to resist external threats and internal divisions.