In the first years of his reign, Dabiša successfully maintained the integrity of Tvrtko's Kingdom of Bosnia, which included not only Bosnia proper, but also Croatia proper, Dalmatia, Zachlumia, and Rascia. The former two had been conquered from King Sigismund and Queen Mary of Hungary, and the Republic of Ragusa's immediate attempts to convince the Dalmatian cities to return to the fold of the Hungarian Crown ended in failure. Sigismund and Mary were not the only one claiming Dalmatia - or the Hungarian lands in general. Insisting that Dabiša did not support his bid for the Hungarian throne as effectively as his predecessor had, King Ladislaus of Naples started to enforce his own claim to Dalmatia and Croatia. Tvrtko I had professed to support Ladislaus when he expanded his realm to include those lands. Dabiša nevertheless remained at Ladislaus' side in his struggle against Sigismund.