 Ruler 4 was succeeded by K 'inich Ich 'aak Chapat in 723 . Around 725 Toniná fought a war against Piedras Negras , a city on the north bank of the Usumacinta River , now in Guatemala . A series of events during his reign were marked on monuments between 726 and 729 and in 730 he rededicated the tomb of his predecessor K 'inich B 'aaknal Chaak . The mother of K 'inich Ich 'aak Chapat is named as Lady Winik Timan K 'awiil and his father may well have been K 'inich B 'aaknal Chaak himself . The reign of K 'inich Ich 'aak Chapat is notable for the absence of the usual sculptures depicting bound war captives , although the reason for this is unknown . 
