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.
[1] Geolsa Biu died in the Battle of Tianmenling, in which Balhae achieved victory and declared autonomy.
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