ing ga . ▁New ▁dwell ings ▁were ▁constructed , ▁roads ▁were ▁built ▁and ▁buildings ▁were ▁improved . ▁He ▁found ▁un pre ced ented ▁new ▁wealth ▁when ▁tin ▁mines ▁were ▁organ ised ▁in ▁Sing ke p . ▁Both ▁the ▁British ▁and ▁Dutch ▁then ▁restored ▁his ▁claim ▁on ▁the ▁R ia u ▁island . ▁He ▁began ▁to ▁rev ive ▁mar itime ▁trade ▁dis cre et ly ▁with ▁the ▁British ▁as ▁a ▁major ▁source ▁of ▁comm od ities , ▁especially ▁valuable ▁tin , ▁g amb ier ▁and ▁sp ices . ▁ ▁Su cc ession ▁crisis ▁and ▁Sultan ▁Abd ul ▁Rah man ▁ ▁In ▁ 1 8 1 2 , ▁the ▁Joh or - R ia u ▁Sultan ate ▁experienced ▁a ▁succession ▁crisis . ▁The ▁death ▁of ▁the ▁Mah m ud ▁Shah ▁III ▁in ▁L ing ga ▁left ▁no ▁he ir ▁apparent . ▁Royal ▁custom ▁required ▁that ▁the ▁succeed ing ▁s ultan ▁must ▁be ▁present ▁at ▁his ▁prede cess or ' s ▁death bed . ▁However ▁at ▁the ▁time ▁Mah m ud ▁Shah ▁III ▁died , ▁the ▁el dest ▁prince , ▁T eng ku ▁Hus sein , ▁was ▁in ▁P ah ang ▁to ▁celebr ate ▁his ▁marriage ▁to ▁the ▁daughter ▁of ▁the ▁B end ah ara ▁( g overn or ). ▁The ▁other ▁candidate ▁was ▁T eng ku ▁Hus sein ' s ▁half - bro ther , ▁T eng ku ▁Abd ul ▁Rah man . ▁ ▁To ▁comp licate ▁matters , ▁neither ▁of ▁the ▁candidates ▁was ▁of ▁full ▁royal ▁blood . ▁The ▁mother ▁of ▁T eng ku