Siret was one of the more stable Latin bishoprics founded in medieval Moldavia.
Antecedents
Since the 13th century, missionaries of the mendicant orders, Franciscans and Dominicans, created several Latin Catholic communities in present Romania, for whom the Holy See decided to created bishoprics, south and east of the Carpathians, generally short-lived, like the Diocese of Siret / Seret / Cereten, established in 1371. Catholicism was on the rise among the traditionally Orthodox population due to the political late 14th century context, as the Ottoman advance, nearly encircling the imperial capital Constantinople, the Byzantine emperors sought a political and hopefully military ally in the Catholic west, which had crusaded against Islam to and in the Middle East before. Similarly in Moldavia, where Bogdan I obtained virtual independence in 1359 as founding voivode, seeking aid and protection from Poland, welcomed Latin missionaries, Franciscan Friars Minor and Dominicans.
History
Bogdan's son and indirect successor Lațcu of Moldavia invited a delegation from Rome, promising 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. On 24 July 1370 the Pope instructed the archbishop of Prague and bishops of Bratislava and Kraków to verify/complete the sincerity of Laţcu and mandated them to erect such diocese covering the Moldavian state. Pope Gregory XI established it in 1371, exempt ; Polish Franciscan Andrzej Jastrzebiec was consecrated first Bishop by archbishop Florian Mokrski of Cracow. The cathedral, dedicated to John the Baptist, was built by queen Margareth, Catholic kin of the Hungarian royal family, which in 1377 had invited Dominicans to Siret. However prince Laţcu favoring of Catholicism met grave opposition from the Orthodox clergy, while effective Latin converts were concentrated in the north of Moldavia, near Catholic neighbour kingdoms Poland and Hungary. Since 1372, when Andrzej was nominated Apostolic administrator of the Archdiocese of Halyč, probably never returning to Siret, he and his successors resided more in Poland then in Moldavia. In 1388 prince Petru II "Muşat" transferred the Moldavian voivode's capital from Siret to Suceava, thus contributing to the crisis in the diocese of Siret, now abandoned by both crown and episcopate. ;Exempt Bishops of Siret
Stefan Martini, Dominican Order , reminded by the Pope he could not celebrate pontifical masses outside his diocese, but in 1396 nominated Auxiliary bishop of the Diocese of Cracovia, maintaining his title as Ordinary of Siret.
The diocese of Siret was effectively suppressed, but from circa 1418, the Holy See erected another Moldavian bishopric, the Diocese of Baia, which inherited its territory.
