History of Song: Zhao Yuanhao submitted a memorial asking for the imperial title and a new era name.; Xu Zizhi Tongjian: On the day jiaxu, Zhao…
On the day jiaxu, Zhao Yuanhao builds an altar, receives the investiture, and assumes the imperial title Shiwen Yingwu Xingfa Jianli Renxiao of Great Xia; he changes the era from Daqing 2nd year to Tianshou Lifa Yanzuo 1st year.
甲戌，趙元昊築壇受冊，僭號大夏始文英武興法建禮仁孝皇帝，改大慶二年為天授禮法延祚元年。
Location: 續資治通鑑 卷041 (1038년 조)
Zhao Yuanhao submitted a memorial asking for the imperial title and a new era name.
癸丑，趙元昊表請稱帝、改元。
Location: 宋史卷010 寶元二年
A and B are two of the sources listed above.
| On what point | Source A | Source B | What differs (in Korean) |
|---|---|---|---|
| Outcome | History of Song (Songshi), Annals | Xu Zizhi Tongjian (Continuation of the Comprehensive Mirror) | a는 칭제·개원 청함, b는 실제 칭제·개원 |