Stela 39 is a broken monument that was erected in the Lost World complex . The upper portion of the stela is missing but the lower portion shows the lower body and legs of Chak Tok Ich 'aak , holding a flint axe in his left hand . He is trampling the figure of a bound , richly dressed captive . The monument is dated to AD 376 . The text on the back of the monument describes a bloodletting ritual to celebrate a Katun @-@ ending . The stela also names Chak Tok Ich 'aak I 's father as K 'inich Muwaan Jol .