Goguryeo's ally while in the southwest, Baekje, fell into the Silla?�Tang alliance in 660; the victorious allies ongoing their assault on Goguryeo for another 8 years. In the meantime, in 666 (though dates vary from 664??66), Yeon Gaesomun died and civil war ensued amongst his 3 sons. Silla?�Tang eventually vanquished https://remington4g196.isblog.net/considerations-to-know-about-goguryeo-room-salon-43957271