Milenko Krešić; (2016) Vjerske prilike u Humskoj zemlji (Stonu i Râtu) u srednjem vijeku (Religious situation in the Hum land (Ston and Rat) during the Middle Ages), {Stefan Prvovjenčani zatražio je 1217. i dobio od pape Honorija III. (1216-1227) kraljevsku krunu, a njegov brat Vukan Nemanjić, vladar Duklje i Trebinja, ostao je katolik do kraja života. "Stefan the First-Crowned asked in 1217 and received from Pope Honorius III. (1216–1227) the royal crown, and his brother Vukan Nemanjić, the ruler of Duklja and Trebinje, remained Catholic until the end of his life."} p. 72 [1]
