Yax Nuun Ahiin I was a ruler of the ancient Maya city of Tikal, located in present-day Guatemala. He reigned during the Late Classic period, around 400-450 AD. His name translates to "First Great Sun," reflecting the importance of solar deities in Maya culture. Yax Nuun Ahiin I is known for his significant contributions to Tikal's architecture and political power. Under his leadership, Tikal expanded its influence and engaged in various alliances and conflicts with neighboring city-states. His reign marked a period of prosperity, as evidenced by the construction of impressive temples and monuments, which are still studied today by archaeologists and historians interested in the Maya civilization.