Stela 4 is dated to AD 396 , during the reign of Yax Nuun Ayiin after the intrusion of Teotihuacan in the Maya area . The stela displays a mix of Maya and Teotihuacan qualities , and deities from both cultures . It has a portrait of the king with the Underworld Jaguar God under one arm and the Mexican Tlaloc under the other . His helmet is a simplified version of the Teotihuacan War Serpent . Unusually for Maya sculpture , but typically for Teotihuacan , Yax Nuun Ayiin is depicted with a frontal face , rather than in profile .