 At the time of his rule Copán was undergoing an unprecedented rise in population, with residential land use spreading to all available land in the entire Copán Valley.The two surviving stelae of Kʼakʼ Chan Yopaat contain long hard-to-decipher hieroglyphic texts and are the oldest monuments at the site to survive without being either broken or buried.He had a long reign, ruling at Copán for 49 years, and he died on 5 February 628.