Kʼan Ahk I
Kʼan Ahk I, also known as Ruler A was a king of the Mayan city of Piedras Nigras. 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