Geolsa Biu
| Geolsa Biu | |||||||
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| Chinese name | |||||||
| Traditional Chinese | 乞四比羽 | ||||||
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| Korean name | |||||||
| Hangul | 걸사비우 | ||||||
| Hanja | 乞四比羽 | ||||||
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Geolsa Biu, also rendered as Qisi Biyu, was a 7th-century military leader of Baishan Mohe ancestry. Geolsa Biu took an active part in Balhae's effort for autonomy against the Tang dynasty. Geolsa Biu died in the Battle of Tianmenling, in which Balhae achieved victory and declared autonomy.