《水经注·卷二十二》
建武二年，司空李通也敬慕孙叔敖，领受这地方为封邑，所以光武帝嘉奖他，并改地名为固始。
建武二年，司空李通，又慕叔敖受邑，故光武以嘉之，更名固始。
In the second year of Jianwu, Sikong Li Tong also admired Sun Shu'ao and accepted this place as a fiefdom, so Emperor Guangwu commended him and changed the name of the place to Gushi.