Original sentence: Before that majority of the population in it were Roman Catholic.Travunia was inhabited by Eastern Orthodox Serbs after 12 century (and House of Nemanjic)
Edited sentence: Travunia (Serbian: Травунија or Травуња, Transliterations: Travunija, Travunja; ; ) was a medieval realm centered at Trebinje in today's eastern Herzegovina and southern Dalmatia (now part of Croatia).Travunia was inhabited by Eastern Orthodox Serbs