Metropolitan Isidore took some time travelling around when he got back from Florence. In Lithuania and Kiev the main reaction was to refuse to recognize him as a Cardinal or Roman legate, but “only” as the Metropolitan of Kiev and All Russia. He was in Kholm on the 27th of July, 1440. And when he finally got to Moscow, March 19, 1441, preceded by his notorious Latin cross, he went to the Kremlin and served Divine Liturgy in the presence of the Great Prince, the Bishops and clergy and the nobility and government sorts. At the Liturgy, instead of commemorating the Constantinopolitan Patriarch, he commemorated the Pope of Rome, Eugene. At the end of the Liturgy, he had his Protodeacon in Stikharion and Orarion go out on the Amvon and proclaim the Act of Union, signed on the 5th of July 1439. This means he joined the Unia in 1439. He came back to Russian territory one year after that, and travelled around for a couple years before this Liturgy in the Kremlin. After the Protodeacon got through, Isidore presented a personal letter from the Pope, asking him to help Isidore introduce the Union. Everybody was surprised: so much so, that not one boyar, prince, or bishop advised the Great Prince one word. The Prince didn’t know what to do either. He considered the matter all by himself for THREE days and finally, on the 4th day, he commanded that Isidore should be thrown into prison. With that, as the Chronicle goes, all the boyars and the bishops and the princes and the multitude of the people, suddenly recalled their Greek heritage, the docrines, the holy writings and began to call Isidore a heretic.