. ▁ ▁History ▁ ▁Found ing ▁of ▁the ▁Sultan ate ▁In ▁ 1 6 9 8 , ▁Z anz ib ar ▁became ▁part ▁of ▁the ▁over se as ▁hold ings ▁of ▁O man ▁after ▁Sa if ▁bin ▁Sultan , ▁the ▁Im am ▁of ▁O man , ▁defeated ▁the ▁Portuguese ▁in ▁M omb asa , ▁in ▁what ▁is ▁now ▁Ken ya . ▁In ▁ 1 8 3 2 ▁or ▁ 1 8 4 0 , ▁O man i ▁r uler ▁Sa id ▁bin ▁Sultan ▁moved ▁his ▁court ▁from ▁Mus cat ▁to ▁Stone ▁Town ▁on ▁the ▁island ▁of ▁Un gu ja ▁( that ▁is , ▁Z anz ib ar ▁Island ). ▁He ▁established ▁a ▁r uling ▁Arab ▁el ite ▁and ▁encourag ed ▁the ▁development ▁of ▁clo ve ▁plant ations , ▁using ▁the ▁island ' s ▁slave ▁labour . ▁Z anz ib ar ' s ▁commerce ▁fell ▁increasing ly ▁into ▁the ▁hands ▁of ▁trad ers ▁from ▁the ▁Indian ▁sub cont inent , ▁whom ▁Sa id ▁encourag ed ▁to ▁sett le ▁on ▁the ▁island . ▁After ▁his ▁death ▁in ▁ 1 8 5 6 , ▁two ▁of ▁his ▁sons , ▁Maj id ▁bin ▁Sa id ▁and ▁Th uw ain i ▁bin ▁Sa id , ▁strugg led ▁over ▁the ▁succession , ▁so ▁Z anz ib ar ▁and ▁O man ▁were ▁divided ▁into ▁two ▁separate ▁real ms . ▁Th uw ain i ▁became ▁the ▁Sultan ▁of ▁Mus cat ▁and ▁O man ▁while ▁Maj id ▁became ▁the ▁first ▁Sultan ▁of ▁Z anz ib ar , ▁but ▁obliged ▁to ▁pay ▁an