Answer:
He felt the need to justify the legitimacy of his claim to the throne.
Step-by-step explanation:
Pacal the Great felt the need to legitimize his claim of the throne by placing his name and likeness on most of the buildings in Palenque.
Pacal raised the city of Palenque from absolutely nothing and ruins to make it a great and powerful city. He decided to extend his building projects by making some elaborate paintings and sculptures of his name and renovating much of the Palenque kingdom with the inscription "Pacal the Great's Reign".