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Son of Jakab (fl. 1282-1329) Bethlen de Bethlen Brother of János (Iván), fl 1329-49 Bethlen de Bethlen; András Bethlen de Bethlen; "Nagy" Jakab Bethlen de Bethlen and Apa Bethlen de Bethlen
http://genealogy.euweb.cz/hung/bethlen2.html
Jakab Bethlen de Bethlen, fl 1282-1329, had issue: