'Black Castle') was a settlement on the banks of the Dniester River, now the city of Bilhorod-Dnistrovskyi, Ukraine, in the 6th century BC.
[1] In 1420, the citadel was attacked for the first time by the Ottomans, but defended successfully by Moldavian Prince Alexander the Good.
The Ottomans claimed to have reached an agreement with Prince Stephen, and promised safe passage to the inhabitants and their belongings; however, most of the city-dwellers were slaughtered.
For Roman Catholics, the territory was part of the Apostolic Vicariate of Tartary, under the spiritual care of the Franciscan friars.
The presence of an Orthodox bishop during this period is noted in a list of bishoprics under the authority of the Patriarchate of Constantinople during the reign of the Emperor Andronikos II Palaiologos.