Maximos, Metropolitan of all Rus
Maximus or Maximos (Russian: Максим) (died 6 December 1305) was the Metropolitan of Kiev (1283–1305) who moved the see of Russian metropolitans to Vladimir-on-Kliazma. In spite of the move, the metropolitans were officially known as "Metropolitan of Kiev and Vladimir" until the establishment of autocephaly under Jonah in 1448.
Maximos was of Greek origin. During the war between Tokhta, Khan of the Golden Horde, and Nogay and the Polovtsy, Maximus left Kiev in 1299 and transferred the metropolitan chair to Vladimir. Following that Patriarch Athanasius I of Constantinople established the Halych metropoly with a see in Halych, Halych-Volhynia.
Maximos is known for his ecclesiastic trips to the Golden Horde and mediation between the quarreling princes of the Northeastern Russia (e.g., Dmitry of Pereslavl and Andrey of Gorodets, sons of Alexander Nevsky). In 1301, Maximos attended a patriarchal council in Constantinople. He supported the Prince of Tver and Vladimir Mikhail Yaroslavich in his struggle with Prince of Moscow Yuri Danilovich for the title of Grand Duke.