Following the devastating Mongol invasion of Ruthenia and sack of Kyiv in 1240, Metropolitan Maximus of Kyiv moved to the town of Vladimir-on-Klyazma in 1299. In 1303 on petition of Ruthenia kings from the Kingdom of Galicia–Volhynia (Ruthenia), Patriarch Athanasius I of Constantinople created a separate Metropolis of Halych that included western parishes of the original Metropolis of Kyiv and all Ruthenia. The new metropolis did not last for long (inconsistently throughout most of the 14th century) and its new Metropolitan Peter of Moscow was consecrated as the Metropolitan of Kyiv and all Ruthenia instead of Metropolitan of Halych. Just before his death Peter moved his episcopal see from Vladimir to Moscow. During his reign there was established Metropolitanate of Lithuania in the Grand Duchy of Lithuania, while after his death Metropolis of Halych was reestablished as well. In 1445 the Metropolitan Isidore with his see in Moscow joined the Council of Florence and became a papal legate of all Ruthenia and Lithuania. After Isidore suffered prosecutions by local bishops and royalty of the Grand Duchy of Moscow, he was banned away from Muscovy, while the Muscovite princes appointed own Metropolitan Jonah of Moscow without consent of the Ecumenical Patriarch of Constantinople.