Desiderius had a brother Roland II,[1] ancestor of the Jolsvai family and a notable baron of the so-called feudal anarchy, who served as Palatine of Hungary.
[2] Desiderius had three sons; Benedict married Margaret Telegdi, and was the first member of the Kaplai (also Serkei) family, which later had divided into two another branches (Lorántfi and Dezsőfi) and flourished until the early 16th century.
Desiderius, his brother Roland and two of his cousins, Rathold II and Nicholas "Vecse" successfully defended the Cistercian monastery at Egres (present-day Igriș in Romania).
Desiderius was present at the siege of Gede Castle (present-day Hodejov, Slovakia), where the rebellious Finta Aba barricaded himself in mid-1281.
[5] By the 1290s, when royal power was severely weakened, Stephen Ákos established a province, which laid mostly in Borsod and Gömör Counties, and ruled de facto independently his dominion during the era of feudal anarchy.
[9] As both counties were ruled by Stephen Ákos, it is plausible that Desiderius belonged to his familia, and managed the administrative affairs of the territories on behalf of his father-in-law.
Politically, he was rather tied to the Ákos clan, than his blood relatives, who ruled roughly Nógrád and Heves counties under the leadership of Desiderius' cousin Dominic II Rátót.