Stephen Ostoja's illegitimate son Stephen Tomas Ostojic had succeeded his uncle Tvrtko II as King of Bosnia in 1443.

Steven Tomas is known to have had a wife Vojača, a commoner he had promised to marry.

After his enthronement, it had become clear that she was unsuited to be a queen.

Because of this, he had sought out Pope Eugene IV, who on May 29, 1445, absolved the marriage and declared Thomas to be the legitimate king of Bosnia.

Thomas had soon made peace with Stjepan Vukčić Kosača, the powerful noble ruling today's Herzegovina region.

The king is now searching for a new wife, and decides to marry Vukčić's daughter Katarina Kosača, which brings some political stability to the kingdom.

They are married on May 26, 1446 in Milodraža near Fojnica.

The couple have three children: Catherine, Sigismund, and another son about whom very little is known.

The Franciscans, who had established a network of friaries in Bosnia during the fourteenth century, have spent more than a century trying to convert members of the Bosnian church to mainstream Catholicism.

This campaign receives the full support of the Bosnian king, Stjepan Tomash, who in 1459 summons the clergy of the Bosnian church and orders them to convert to Catholicism or leave the kingdom.

The back of the Bosnian church is broken when most of the clergy converts.

Constant dynastic quarrels and the increased influence of a few magnates have diminished the authority of the Bosnian throne under Tvrtko's successors; Hungarian and Turk intervention has also reduced the size and undermined the independence of the Bosnian state.

Stephen Tomashevic succeeds Stephen Tomas Ostojic in 1461.

The settlement of Vrh-Bosna had existed in the Sarajevo valley as a Slavic citadel from 1263 until it was conquered in 1429 by the Ottoman Empire's warriors.

Under Isa-Beg Isaković, the first Ottoman governor of the Bosnia Province, the settlement is established in 1461 as a city, named Bosna-Saraj, around the citade.

The name Sarajevo is derived from Turkish saray ovası, meaning the field around saray.

The Ottoman Turks conquer most of the rest of Bosnia proper in 1463, although Hungary takes over parts of Herzegovina and some northern areas of Bosnia.