▁by ▁G aj ah ▁M ada , ▁which ▁appointed ▁local ▁r ul ers ▁and ▁established ▁social ▁structures . ▁As ▁the ▁emp ire ▁decl ined , ▁Bang ka ▁fell ▁into ▁neglect . ▁▁ ▁Bang ka ▁was ▁recorded ▁as ▁P eng j ia ▁hill ▁( <0xE5> <0xBD> <0xAD> 加 山 ) ▁in ▁the ▁ 1 4 3 6 ▁X ing cha ▁Sh engl an , ▁compiled ▁by ▁the ▁Chinese ▁soldier ▁Fe i ▁X in ▁during ▁the ▁tre asure ▁voy ages ▁of ▁Admir al ▁Zh eng ▁He . ▁Contempor ary ▁records ▁show ▁that ▁the ▁area ▁- ▁close ▁to ▁the ▁busy ▁Stra it ▁of ▁Mal ac ca ▁and ▁waters ▁of ▁the ▁Mus i ▁River ▁- ▁had ▁significant ▁presence ▁of ▁Chinese ▁trad ers . ▁ ▁Later ▁on , ▁the ▁island ▁was ▁taken ▁over ▁by ▁the ▁Joh or ▁and ▁Min ang k ab au ▁Sultan ates ▁which ▁introduced ▁Islam ▁to ▁the ▁island . ▁It ▁continued ▁to ▁pass ▁to ▁the ▁B anten ▁Sultan ate ▁before ▁it ▁was ▁then ▁inherited ▁by ▁the ▁nearby ▁Pale mb ang ▁Sultan ate ▁som etime ▁in ▁the ▁late ▁ 1 7 th ▁century . ▁So on ▁after , ▁around ▁ 1 7 1 0 , ▁tin ▁was ▁discovered ▁on ▁the ▁island ▁which ▁attract ed ▁migr ants ▁from ▁across ▁the ▁arch ip el ago ▁and ▁beyond . ▁Des c end ants ▁of ▁the ▁Chinese ▁imm igr ants , ▁mainly ▁from ▁Gu ang d ong , ▁still ▁form ▁a ▁large ▁portion ▁of ▁modern ▁Bang ka ' s ▁inhabitants . ▁ ▁As ▁tin ▁min ing ▁developed ▁further , ▁the