ant u ▁Khan ▁granted ▁him ▁the ▁de ▁j ure ▁rights ▁to ▁rule ▁the ▁Golden ▁Hor de ▁( U lus ▁of ▁J och i ▁in ▁the ▁Y uan ▁sources ). ▁By ▁the ▁ 1 3 3 0 s , ▁Ö z ▁Beg ▁had ▁begun ▁sending ▁t ribute ▁to ▁the ▁Mong ol ▁Y uan ▁Em per ors ▁and ▁received ▁his ▁share ▁from ▁J och id ▁poss essions ▁in ▁China ▁and ▁Mong olia ▁in ▁exchange . ▁ ▁Ö z ▁Beg ▁was ▁engaged ▁in ▁wars ▁with ▁Bulg aria ▁and ▁the ▁By z antine ▁Empire ▁from ▁ 1 3 2 0 ▁to ▁ 1 3 3 2 . ▁He ▁repeatedly ▁ra ided ▁Th race , ▁partly ▁in ▁service ▁of ▁Bulg aria ' s ▁war ▁against ▁both ▁By z ant ium ▁and ▁Ser bia ▁that ▁began ▁in ▁ 1 3 1 9 . ▁His ▁arm ies ▁pill aged ▁Th race ▁for ▁ 4 0 ▁days ▁in ▁ 1 3 2 4 ▁and ▁for ▁ 1 5 ▁days ▁in ▁ 1 3 3 7 , ▁taking ▁ 3 0 0 , 0 0 0 ▁capt ives . ▁After ▁Ö z ▁Beg ' s ▁death ▁in ▁ 1 3 4 1 , ▁his ▁success ors ▁did ▁not ▁continue ▁his ▁ag gress ive ▁policy ▁and ▁contact ▁with ▁Bulg aria ▁la ps ed . ▁His ▁attempt ▁to ▁re assert ▁Mong ol ▁control ▁over ▁Ser bia ▁was ▁un success ful ▁in ▁ 1 3 3 0 . ▁By z antine ▁Emperor ▁And ron ik os ▁III ▁ ▁pur port edly ▁gave ▁his ▁il leg