Turtle Tooth was the third king of Mayan city-state

Maya civilization

The Maya is a Mesoamerican civilization, noted for the only known fully developed written language of the pre-Columbian Americas, as well as for its art, architecture, and mathematical and astronomical systems. Initially established during the Pre-Classic period The Maya is a Mesoamerican...

 Piedras Negras in Guatemala

Guatemala

Guatemala is a country in Central America bordered by Mexico to the north and west, the Pacific Ocean to the southwest, Belize to the northeast, the Caribbean to the east, and Honduras and El Salvador to the southeast...

. He is also known as Ah Cauac Ah K'in. He was a successor of Ruler B

Piedras Negras Ruler B

Piedras Negras Ruler B was the second ruler of that Mayan city in Guatemala. He was a successor of Ruler A. He reigned c. 478.Nothing is known of this king except that one of his lieutenants, a yajawte , was captured by Yaxchilan ruler Bird Jaguar II, probably in AD 478, as recorded at...

.

The first mention of Turtle Tooth comes in the inscriptions of Yaxchilan

Yaxchilan

Yaxchilan is an ancient Maya city located on the bank of the Usumacinta River in what is now the state of Chiapas, Mexico. In the Late Classic Period Yaxchilan was one of the most powerful Maya states along the course of the Usumacinta, with Piedras Negras as its major rival...

 when one of his sublords is captured by Knot-eye Jaguar I. However, it is likely that Piedras Negras had gained some degree of ascendancy over Yaxchilan.

It is possible that he is depicted on Panel 2.

His successor was Piedras Negras Ruler C

Piedras Negras Ruler C

Piedras Negras Ruler C was a king of that Maya city-state. He was the fourth ruler of Piedras Negras, successor of Turtle Tooth, who could be his father....

. He could be his son.