Historian Ubul Kállay argued Apa and Lucas were the sons of Alexius Gutkeled, a Ban of Slavonia during the reign of Stephen II of Hungary.
[4] The brothers – Apa and Lucas – came to prominence after the departure of King Géza's maternal uncle, Beloš, who became disgraced at the royal court and fled Hungary in late 1157.
[5] In this capacity, he governed the Dalmatian coastal region (Croatian Littoral or Primorje), and the area between the rivers Drava and Sava still did not fall under his jurisdiction.
[7] According to a decretal of Pope Alexander III, when the papal legate, cardinal Pietro di Miso was sent to Hungary to hand over the pallium to Lucas of Esztergom in 1161, the archbishop's brother "Alban" (most scholars identified him with Apa) provided a horse for the legate, when Pietro and his escort entered the Hungarian border via Dalmatia (thus Apa perhaps still functioned as ban in that year).
In 1244, Peter bequeathed his estate Reviscse (present-day Blatné Revištia, Slovakia) to his daughter Catherine, who was the wife of Jakó (I) Kaplon.
In the next year, Agnes donated these estates to their daughters and grandsons, establishing the Nagymihály lordship, an important fortune of the Kaplon clan.