 Complete the following phrase:  In 1245, Petro Akerovych of Ruthenian origin, the Metropolitan of Kiev, participated in the First Council of Lyon, where he informed Catholic Europe of the MongolTatar threat. In 1299, Maximus of Greek origin, the Metropolitan of Kiev, eventually moved the seat of the Metropolitanate from Kiev to Vladimir-on-Kliazma, keeping the title. Since 1320, the city was the site of a new Catholic bishopric, when Henry, a Dominican friar, was appointed the first missionary Bishop of Kiev Kyiv. In the early 1320s, a Lithuanian army led by Gediminas defeated a Slavic army led by Stanislav of Kiev at the 