He was born as the son of David I, a member of the genus (clan) Aba, who was mentioned as "ispán" (comes) in contemporary sources and ancestor of the Berthóty family.
Ia dilahirkan sebagai putra David I, seorang anggota genus (wangsa) Aba, yang konon sebagai "ispán" (comes) di dalam sumber kontemporer dan merupakan leluhur keluarga Berthóty.