Yax Ehb Xook

Yax Ehb Xook, also known as Yax Moch Xok and Yax Chakte'I Xok, (fl. c.90) was dynastic founder and ajaw of the Maya city-state of Tikal. He ruled c.90 AD.

Previous estimates had placed the founder at AD 170-235 or AD 219-238. But these ranges had been derived by placing the death of the ninth ruler Chak Tok Ich'aak I who died in AD 378. In fact Chak Tok Ich'aak I, who died in 378, was Tikal's fourteenth ruler and not its ninth. This earlier foundation date only reinforces Tikal's pivotal role in the genesis of Classic civilization in the Maya Lowlands, synchronizing it with developments in the Highlands and Pacific Coast that have traditionally been designated Late Preclassic but bear most of the hallmarks of Early Classic civilization.