Ladislaus eventually made peace with Solomon, when the latter gave up all claims to the throne of Hungary, however, later on he rebelled against Ladislaus, who took him prisoner and held him in the fortress of Visegrád. On the occasion of the canonization of Stephen I, Ladislaus gave Solomon his freedom, but in 1086 Solomon, with the aid of the heathen Cumans, revolted against Ladislaus a second time. Ladislaus, however, vanquished them again, and in 1089 gained another victory over theTurkish Cumans. In 1091 Ladislaus marched into Croatia at the request of his sister, the widowed Queen Helena, and took possession of the kingdom for the crown of Hungary where, in 1092, he founded the Bishopric of Agram (Zágráb). In the same year (1092), he also founded the Bishopric of Grosswardein (Nagy-Várad) in Hungary, which, however, some trace back to Stephen I.
Ladislaus governed the religious and civil affairs of his assembly of the Imperial States at Szabolcs, that might almost be called a synod. He tried vigorously to suppress the remaining heathen customs. He was buried in the cathedral of Grosswardein. He still lives in the sagas and poems of his people as a chivalrous king.
He was canonized by Celestine III in 1192.
