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Tikal and Teotihuacan

As early as 200 AD, Teotihuacan had embassies in Tikal.

The fourteenth king of Tikal was Chak Tok Ich'aak (Great Jaguar Paw). Chak Tok Ich'aak built a palace that was preserved and developed by later rulers until it became the core of the Central Acropolis. Little is known about Chak Tok Ich'aak except that he was killed on 14 January 378 AD. On the same day, Siyah K’ak' (Fire Is Born) arrived from the west, having passed through El Peru, a site to the west of Tikal, on 8 January. On Stela 31 he is named as "Lord of the West". Siyah K’ak' was probably a foreign general serving a figure represented by a non-Maya hieroglyph of a spearthrower combined with an owl, a glyph that is well known from the great metropolis of Teotihuacan in the distant Valley of Mexico. Spearthrower Owl may even have been the ruler of Teotihuacan. These recorded events strongly suggest that Siyah K’ak' led a Teotihuacan invasion that defeated the native Tikal king, who was captured and immediately executed. Siyah K'ak' appears to have been aided by a powerful political faction at Tikal itself; roughly at the time of the conquest, a group of Teotihuacan natives were apparently residing near the Lost World complex. He also exerted control over other cities in the area, including Uaxactun, where he became king, but did not take the throne of Tikal for himself. Within a year, the son of Spearthrower Owl by the name of Yax Nuun Ayiin I (First Crocodile) had been installed as the fifteenth king of Tikal while he was still a boy, being enthroned on 13 September 379. He reigned for 47 years as king of Tikal, and remained a vassal of Siyah K'ak' for as long as the latter lived. It seems likely that Yax Nuun Ayiin I took a wife from the preexisting, defeated, Tikal dynasty and thus legitimized the right to rule of his son, Siyaj Chan K'awiil II.

Río Azul, a small site 100 kilometers (62 mi) northeast of Tikal, was conquered by the latter during the reign of Yax Nuun Ayiin I. The site became an outpost of Tikal, shielding it from hostile cities further north, and also became a trade link to the Caribbean.

Although the new rulers of Tikal were foreign, their descendants were rapidly Mayanized. Tikal became the key ally and trading partner of Teotihuacan in the Maya lowlands. After being conquered by Teotihuacan, Tikal rapidly dominated the northern and eastern Peten. Uaxactun, together with smaller towns in the region, were absorbed into Tikal's kingdom. Other sites, such as Bejucal and Motul de San José near Lake Petén Itzá became vassals of their more powerful neighbor to the north. By the middle of the 5th century Tikal had a core territory of at least 25 kilometers (16 mi) in every direction.

Around the 5th century, an impressive system of fortifications consisting of ditches and earthworks was built along the northern periphery of Tikal's hinterland, joining up with the natural defenses provided by large areas of swampland lying to the east and west of the city. Additional fortifications were probably also built to the south. These defenses protected Tikal's core population and agricultural resources, encircling an area of approximately 120 square kilometers (46 sq mi). Recent research suggests that the earthworks served as a water collection system rather than a defensive purpose.