At the end of 1386 Jogaila returned to Vilnius to carry out his other promise – to convert the Grand Duchy to Catholicism. He brought some priests, established the first seven parishes, and, according to Jan Długosz, even personally translated Lord's Prayer and Apostles' Creed into the Lithuanian language. New converts were baptized "en masse", with little teaching, and were awarded wool shirts; the haste was later criticized at the Council of Constance. On 17 February 1387 Jogaila decreed that he would build Vilnius Cathedral and petition the pope to establish the Diocese of Vilnius, which he awarded with land possessions in Tauragnai, Labanoras, Molėtai. Two other privileges, issues on 20 February and 4 March 1387, awarded nobles who would convert to Christianity with new rights and granted Magdeburg rights to Vilnius. This served not only as an incentive for conversion but also equalized nobility rights in Poland and Lithuania.