Benedict was born into an unidentified family from Zala County, whose nobility was confirmed shortly after the First Mongol invasion of Hungary. According to 19th-century clerical historian Antal Pór, he belonged to the "gens" Nádasd (ancestor of the wealthy Nádasdy family), while Mór Wertner identified him as a member of the Lőrinte kindred, but other historians do not share either viewpoints. Benedict had three brothers, Dedalus, "ispán" of Zala County (1273–1274), Beke and Stephen. When Atyusz V Atyusz was charged disloyalty by Ladislaus IV of Hungary, the king donated the Szentmiklós Castle and its surrounding villages to them in 1276, not long before Benedict's death.