After the successful campaign, the alliance of Hungarian nobles, Székelys, and Saxon elite was codified in the "Unio Trium Nationum" ("Union of Three Nations") on February 2, 1438. Like the Brotherly Union, the new Union provided mutual aid against peasant revolts and Ottoman attacks. The Union ensured that the (Hungarian and Romanian) serfs continued to be excluded from the political life of Transylvania, although they were the majority of the population in the Noble Counties ("Comitates"). The Romanians adhered to Eastern Orthodoxy, which in predominantly Catholic Hungary was considered heretical.