Ladislaus originated from the Zala branch of the extended gens (clan) Péc, which had large-scale possessions in several counties of Transdanubia, in addition to other parts of the Kingdom of Hungary.
His father was Serfesd, who was referred with the surname Nevnai after his residence Nevna (or Névna), present-day Levanjska Varoš in Croatia.
His uncles were Denis Péc, a powerful baron and Palatine of Hungary in the second half of the 13th century, and Peter Ludbregi, who owned Ludbreg.
[2] She is mentioned by a sole document in 1290, when she was granted the castle of Orjava (today Orljavac, Croatia) from her father Gregory Kórógyi.
[5][6] Nevnai handed over his estate of Nevna to his son-in-law Nicholas Treutel in 1324 (Catherine inherited daughters' quarter within this).