Given the 14th century decline of the Byzantine empire as Orthodox regional superpower-ally and Latin mendicant orders missions since the 13th century, the prince Bogdan I of Moldavia obtained virtual independence in 1359 as founding "voivode" (autonomous prince), seeking aid and protection from Poland, welcomed Latin missionaries, Francescans (founding a monastery at Siret in 1340) and Dominicans. His son and indirect successor Lațcu of Moldavia (1365-1373) promised Rome his and the people's conversion to Catholicism and asked Pope Urban V to send missionaries and erect a Latin diocese in his principality's capital, Siret, which happened in 1371, initially directly subject to the Holy See until 1412 when it was made suffragan of the Archbishopric of Lviv (Lwów in Polish; now in Ukraine). This Roman Catholic Diocese of Siret started to decline in 1388 when prince Petru of Moldavia transferred the Moldavian voivode's capital from Siret to Suceava, and was effectively suppressed, but from circa 1418, the Holy See erected another Moldavian bishopric, the Diocese of Baia, which inherited its territory (1434?).