Yax Pasah was a prominent ruler of the ancient Maya city of Palenque, located in present-day Mexico. He reigned during the late 7th century and is known for his significant contributions to the city's architecture and culture. Under his leadership, Palenque flourished, and many important structures, including temples and palaces, were constructed. Yax Pasah is also recognized for his role in the development of Maya hieroglyphics and inscriptions. His reign is marked by the creation of detailed stelae that documented historical events and royal lineage, providing valuable insights into Maya civilization and its history.