[4][5] In 1463, Sabančić's father, brother Tvrtko and first cousin, King Stephen Tomašević, were executed on the order of the Ottoman Sultan Mehmed II, while the Kingdom of Bosnia was annexed to the Ottoman Empire.
In the last months of 1465, Mehmed the Conqueror named Sabančić King of Bosnia.
However, Sabančić gained little more than the title, as the actual kingdom was defunct.
The only sources that mention him are those of the Republic of Ragusa and are related to his granting favours.
The second Ottoman puppet in Bosnia was Matija Vojsalić, installed in March or April 1476,[7] while at the same time King Matthias Corvinus of Hungary named Nicholas of Ilok as the Hungarian puppet King of Bosnia.