K'inich Yo'nal Ahk I, ruler of Piedras Negras
Kʼinich Yoʼnal Ahk I (Mayan pronunciation: [kʼinitʃ joːnal ahk]), also known as Ruler 1 (died February 3, 639 AD), was an ajaw of Piedras Negras, an ancient Maya settlement in Guatemala. He ruled during the Late Classic Period, from 603–639 AD. It has been proposed that he began a new dynasty at Piedras Negras, following years of ineffective kings. As to how Kʼinich Yoʼnal Ahk I came to power, a consensus has not yet been reached, although it is known that he waged several successful wars against Palenque and Sak Tzʼiʼ. He was succeeded by his son, Itzam Kʼan Ahk I, in 639 AD and left behind several monuments, including stelae at Piedras Negras and a large mortuary temple now known as Pyramid R-5.