5 7 1 – d ied ▁ 1 6 1 2 ), ▁known ▁in ▁fol kl ore ▁as ▁I vo ▁Sen jan in ▁(" I vo ▁of ▁Sen j "), ▁was ▁a ▁H abs burg ▁Cro at ian ▁U sk ok ▁who ▁led ▁numerous ▁military ▁explo its ▁against ▁the ▁Ott oman ▁Empire . ▁Due ▁to ▁few ▁historical ▁sources , ▁much ▁of ▁what ▁is ▁known ▁about ▁him ▁today ▁is ▁mainly ▁attributed ▁to ▁legend ▁and ▁fol kl ore ▁detail ing ▁his ▁life ▁and ▁accomplish ments ▁with ▁a ▁medieval ▁rom antic ism . ▁ ▁Life ▁Ivan ▁V lat k ović ▁was ▁born ▁som etime ▁in ▁the ▁ 1 6 th ▁century . ▁According ▁to ▁Y ug oslav ▁historian ▁Vas o ▁Č ub ril ović , ▁he ▁was ▁the ▁son ▁of ▁Nov ak , ▁and ▁belonged ▁to ▁a ▁notable ▁family ▁of ▁Sen j , ▁from ▁where ▁his ▁family ▁origin ated . ▁According ▁to ▁Ser bian ▁writer ▁, ▁his ▁ancest ors ▁were ▁originally ▁from ▁Herz egov ina , ▁while ▁according ▁to ▁Bos n ian ▁Cro at ▁writer ▁, ▁Sen jan in ▁was ▁born ▁in ▁Sen j ▁or ▁somewhere ▁nearby ▁into ▁a ▁family ▁of ▁imm igr ants ▁from ▁Herz egov ina , ▁the ▁son ▁of ▁a ▁V lat ko ▁Jur je vić . ▁According ▁to ▁S iv ri ć ▁he ▁had ▁three ▁sib lings , ▁brothers ▁George ▁and ▁Nicholas , ▁and ▁sister ▁Mat ija . ▁ ▁As ▁a ▁ha j du k ▁captain , ▁he ▁fought ▁against ▁the ▁Ott om ans ▁all ▁over ▁the ▁B alk ans , ▁including