Mikó was a Hungarian prelate in the twelfth century. He was Archbishop of Kalocsa between around 1156 and 1165. He crowned two Hungarian monarchs, Ladislaus II and Stephen IV king, because Lucas, Archbishop of Esztergom, who considered them as usurpers, had denied to perform the ceremony.

Stephen III was King of Hungary and Croatia between 1162 and 1172. He was crowned king in early June 1162, shortly after the death of his father, Géza II. However, his two uncles, Ladislaus and Stephen, who had joined the court of the Byzantine Empire, challenged his right to the crown. Only six weeks after his coronation, the Byzantine Emperor Manuel I Komnenos launched an expedition against Hungary, forcing the Hungarian lords to accept Ladislaus' rule. Stephen sought refuge in Austria, but returned and seized Pressburg. Ladislaus, who died on 14 January 1163, was succeeded by Stephen's younger uncle and namesake, Stephen IV, without resistance, but his rule was unpopular. The young Stephen defeated his uncle on 19 June 1163 and expelled him from Hungary.