Ladislaus III of Hungary

Ladislaus III was King of Hungary and Croatia between 1204 and 1205. He was the only child of King Emeric. Ladislaus was crowned king upon the orders of his ill father, who wanted to secure his infant sons succession. The dying king made his brother, Andrew, regent for the period of Ladislauss minority. However, Duke Andrew ignored the childs interests. As a result, Ladislauss mother, Constance of Aragon, fled to Austria, taking Ladislaus with her. Ladislaus died unexpectedly in Vienna.

Ladislaus was the only known child of King Emeric and his wife, Constance of Aragon. The exact date of Ladislauss birth is unknown, but it is likely that he was born around 1200, according to historians Gyula Krist and Ferenc Makk. After falling seriously ill, King Emeric ordered Ladislauss coronation in an attempt to secure a smooth succession for his infant son. John, Archbishop of Kalocsa, crowned Ladislaus onAugust 1204. Emeric reconciled with his defiant younger brother, Andrew, whom he had imprisoned. He set Andrew free, and made him regent for the duration of Ladislauss minority.

Source: Wikipedia