Rushen Abbey is a former abbey on the Isle of Man, located in Ballasalla. Originally home for monks of the Savignac order, it soon came under Cistercian control and remained so until its dissolution. The abbey is located two miles from Castle Rushen, the politically most important site on the island in medieval times. Both these sites are on the Awin Ros…Rushen Abbey is a former abbey on the Isle of Man, located in Ballasalla. Originally home for monks of the Savignac order, it soon came under Cistercian control and remained so until its dissolution. The abbey is located two miles from Castle Rushen, the politically most important site on the island in medieval times. Both these sites are on the Awin Rosien, a river now called the Silver Burn.