bey ▁of ▁S ust eren , ▁and ▁the ▁ab bey ▁Rol du c , ▁one ▁of ▁the ▁most ▁important ▁monaster ies ▁in ▁the ▁Dutch - spe aking ▁part ▁of ▁the ▁dioc ese ▁of ▁Li ège . ▁ ▁History ▁▁ ▁The ▁women ' s ▁ab bey ▁of ▁Bel is ia ▁( B il zen ) ▁was , ▁according ▁to ▁legend , ▁founded ▁around ▁ 6 7 0 ▁by ▁the ▁holy ▁Land r ada , ▁possibly ▁under ▁the ▁direction ▁of ▁Lam bert us , ▁bishop ▁of ▁Ma astr icht ▁( from ▁ 6 6 9 ▁to ▁ 7 0 9 ). ▁Another ▁legend ▁mentions ▁the ▁Holy ▁Am or ▁of ▁Aqu itaine ▁as ▁the ▁founder ▁of ▁the ▁monaster y . ▁The ▁ab bey ▁church ▁is ▁also ▁named ▁after ▁him . ▁The ▁village ▁that ▁formed ▁near ▁the ▁ab bey ▁was ▁named ▁Bel is ia ▁Mon aster ii , ▁or ▁Mun ster bil zen , ▁to ▁distinguish ▁between ▁Be u ken bil zen ▁( now ▁Bil zen ) ▁and ▁E iken bil zen ▁( now ▁called ▁E igen bil zen ). ▁ ▁In ▁ 8 8 1 ▁the ▁ab bey ▁of ▁Mun ster bil zen , ▁as ▁well ▁as ▁the ▁ab bey ▁of ▁Sint - T ru iden ▁and ▁the ▁churches ▁of ▁T ong eren , ▁Li ège , ▁and ▁Ma astr icht , ▁were ▁destroyed ▁by ▁the ▁Norm ans . ▁In ▁the ▁third ▁quarter ▁of ▁the ▁ 1 0 th ▁century ▁the ▁monaster y ▁was ▁re built , ▁and ▁there after ▁called ▁Mon aster ium ▁San ct