An earthquake struck Pingyang; 10,826 houses collapsed and 150 people were crushed to death. (History of Yuan (Yuanshi), Annals 元史 卷16 世祖 1291年 8月)
Yang Shang, Hemi, and Zhang Wenhu, deputy myriarchs of sea-going ships, were made commanders-in-chief to lead troops to conquer Liuqiu (Ryukyu). (History of Yuan (Yuanshi), Annals 元史 卷16 世祖 1291年)
In the twelfth month the water turned west at Changping, flowed south past the Yongshan Marsh into the west water gate of the city, gathered at Jishuitan, came out to the southeast and merged with the old Yunliang River; there was a lock every ten li, seven locks to Tongzhou (the Tonghui River works). (Xu Zizhi Tongjian (Continuation of the Comprehensive Mirror) 권190 十二月 단락190.68.2)
Korean Peninsula (2)
Hap-dan crosses Cheolnyeong into Gyoju-do, attacks Yanggeun Fortress, and takes it. (Goryeosa (History of Goryeo) 世家 卷30 忠烈 十七年)
1291: Hadan is stationed at Wonju. Fifty cavalry come to Chiaksseong and plunder cattle and horses, and Won Chung-gap pursues them with six foot soldiers and seizes eight horses (Goryeosa Jeolyo (Essentials of Goryeo History) 권21 忠烈王 十七年)