His father held the most important secular positions, when Ladislaus' career has begun. He was first mentioned as Master of the horse, Nyitra and Bács Counties. From 1232 to 1234, he functioned as head of Moson County. The elderly Andrew II appointed him Judge royal for the second time in 1234, he held that dignity until the next year. He also governed Bács County again. Andrew II died in September 1235, which had serious consequences for either the private life and political career of Ladislaus. Béla IV, who succeeded his father without opposition, had long opposed his father's "useless and superfluous perpetual grants" and also wanted to build a new power base. Following his coronation, he dismissed and punished many of his father's closest advisors. The financial expert Denis, son of Ampud was blinded, while Ladislaus' father Julius I was imprisoned and died in captivity in 1237. Ladislaus himself avoided execution or prison, but lost political influence for years. Nonetheless he functioned as ispán of Somogy County between 1236 and c. 1239. Ladislaus fought in the disastrous Battle of Mohi on 11 April 1241. When the Mongols were chasing after the episcopal troops of Bartholomew le Gros, the Bishop of Pécs, Ladislaus and his soldiers saved the life of the prelate. As Roger of Torre Maggiore's Epistle to the Sorrowful Lament writes, " When some Tatars sent their horses at full gallop after them , ispán Ladislas, who was hastening to the king with his troop under unfurled flags, suddenly came upon them, knowing nothing of what had happened. The bishop, recognizing the Hungarian flags, turned to the ispán, and the Tatars, noticing the great numbers, retreated and pursued others. Thus the bishop, departing together with the ispán, escaped from their hands." Following this, Ladislaus regained his former influence at the court. He was already appointed Judge royal by Béla IV in 1242. In the same year, he was promoted to the office of Palatine of Hungary and also received the ispánate of Somogy County. He held these offices until 1244 or 1245, and according to non-authentic royal charters, he was Palatine in 1246 yet. After that he served as Ban of Slavonia from 1245 to 1247 under the title "banus et dux", following Denis Türje's denomination. In 1247, Ladislaus was elected Judge royal for the fourth and final time.
