Kʼan Ahk I, also known as Ruler A was a king of that Mayan city. He is also known as Turtleshell. He reigned c. 460. It seems that he was captured. His name combines the distinctive knotted headdress of God N with that aged earth deity's turtle shell and kʼan ("yellow/precious") marking; altogether it is probably read as itzamkʼanahk. Notes Kings of Piedras Negras 5th century in the Maya civilization 5th-century monarchs in North America