KÃ Âlsa Piu (), also rendered as Qisi Biyu, was a 7th-century military leader of Baishan Mohe ancestry. KÃ Âlsa Piu took an active part in Balhae's effort for autonomy against the Tang dynasty. KÃ Âlsa Piu died in the Battle of Tianmenling, in which Balhae achieved victory and declared autonomy.