Yax Nuun Ahiin I took the throne as the ruler (ajaw) of the Mayan city of Tikal.

Yax Nuun Ahiin I, also known as Curl Snout and Curl Nose, was a 4th-century ruler of the Maya city of Tikal. His name, when transcribed, is YAX-?-AH:N, translated "First ? Crocodile". He took the throne on 12 September 379 and reigned until his death. He is referred to by the Mayan title ajaw, meaning lord.

Ajaw or Ahau ('Lord') is a pre-Columbian Maya political title attested from epigraphic inscriptions. It is also the name of the 20th day of the tzolkʼin, the Maya divinatory calendar, on which a ruler's kʼatun-ending rituals would fall.

The Maya civilization was a Mesoamerican civilization that existed from antiquity to the early modern period. It is known by its ancient temples and glyphs (script). The Maya script is the most sophisticated and highly developed writing system in the pre-Columbian Americas. The civilization is also noted for its art, architecture, mathematics, calendar, and astronomical system.

Tikal is the ruin of an ancient city, which was likely to have been called Yax Mutal, found in a rainforest in Guatemala. It is one of the largest archaeological sites and urban centers of the pre-Columbian Maya civilization. It is located in the archaeological region of the Petén Basin in what is now northern Guatemala. Situated in Petén Department, the site is part of Guatemala's Tikal National Park and in 1979 it was declared a UNESCO World Heritage Site.