388年八月，苻登立兒子苻崇為皇太子，苻弁為南安王，苻尚為北海王。389年，苻登進攻後秦右將軍吳忠，攻克平涼。八月，威逼安定。後秦皇帝姚萇留尚書令姚鎮守安定，在深夜率三萬騎兵人直奔大界，偷襲前秦等待搬運的糧草物資，攻克大界，殺死了毛皇后和南安王苻弁、北海王苻尚，俘獲幾十名將軍，驅趕掠走五萬餘男女兵丁，凱旋。
參考資料
- 《資治通鑑》·晉紀
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