sentences:  Dae Yeon-rim established the kingdom of Heung-yo at the western region of the former territories of Balhae.The fall of Heung-yo Kingdom was a very tragic one, as it fell at the hands of a traitor, who was a subcommander of Dae Yeon-rim himself.When the Liao invaded and attempted to conquer the kingdom, all castles but one were left standing.