History of Liao: Bohai was renamed the Dongdan state, the city of Holhan was renamed Tianfu, and crown prince Yelü Bei was invested as Prince of…
To attack Balhae's ruler Dae Inseon, the Khitan ruler raises a large army and besieges Holhan Fortress.
至是，契丹主謂左右曰「世讎未雪，豈宜安處？」乃大擧，攻渤海大諲譔，圍忽汗城。
Location: 世家 卷1 太祖 八年
The Khitan besiege and destroy Balhae's capital Holhan, renaming it Dongdan; Balhae crown prince Dae Gwanghyeon and tens of thousands of households defect to Goryeo
隣于我境，而與契丹世讎，契丹主大擧攻渤海，圍忽汗城，滅之，改爲東丹國。
Location: 권1 太祖神聖大王 八年
Bohai was renamed the Dongdan state, the city of Holhan was renamed Tianfu, and crown prince Yelü Bei was invested as Prince of Renhuang.
丙午，改渤海國為東丹，忽汗城為天福。
Location: 遼史 卷2 天顯1年 2月
A and B are two of the sources listed above.
| On what point | Source A | Source B | What differs (in Korean) |
|---|---|---|---|
| Year | History of Liao (Liaoshi) | Goryeosa Jeolyo (Essentials of Goryeo History) | a는 926, b는 925 |
Place: 忽汗城
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