Snipped, Carved, Whittled, Tweaked, Gramatically Enhanced and Otherwise Adapted from Wikipedia:
Palenque is perhaps the most studied and written about of Maya sites. Although it is a medium-sized site, much smaller than such huge sites as Tikal or Copán, Palenque, a UNESCO World Heritage Site, contains some of the finest architecture, sculpture, and bas-relief carvings the Maya produced.
The site was already long abandoned when the Spanish arrived in Chiapas. The first European to visit the ruins and publish an account was Father Pedro Lorenzo de la Nada in 1567; at the time the local Chol Maya called it Otolum meaning "Land with strong houses", de la Nada roughly translated this into Spanish to give the site the name "Palenque", meaning "fortification".
K'inich Janaab' Pacal, also known as Pacal the Great, is the most famous of the Maya Ajaw (king, lord, leader, ruler). Starting at twelve years of age, he reigned in B'aakal, the Maya city-state in which Palenque was the largest city, from 615-683. Known as the favorite of the gods, he carried Palenque to new levels of splendor, in spite of having come to power when the city was at a low point. During his government, most of the palaces and temples of Palenque were constructed; the city flourished as never before, eclipsing Tikal. The central complex, known as The Palace, was enlarged and remodeled on various occasions, notably in the years 654, 661, and 668.
After the death of Pacal the Great in 683, his eldest son K'inich Kan B'alam assumed the kingship of B'aakal, who in turn was succeeded in 702 by his brother K'inich K'an Joy Chitam II. The first continued the architectural and sculptural works that were begun by his father, as well as finishing the construction of the famous tomb of Pacal and starting ambitious projects such as the Group of the Crosses. The second, with the same enthusiasm for construction and art, continued reconstructing and enlarging the north side of the Palace. Thanks to the reign of Pacal the Great and those of his two sons, Palenque enjoyed a century of growth and splendor.
In 711, Palenque was sacked by the realm of Toniná, and the old king K'inich K'an Joy Chitam II was taken prisoner, and for ten years there was no Ajaw. Finally, a man named K'inich Ahkal Nab' arrived to power, most likely after years of maneuvering and forging political alliances. Whether he was a direct descendant of Pacal the Great or not remains a mystery. This king, his son and grandson, governed until the end of the 8th century. Little is known about this time period, except that, among other events, the war with Toniná continued, and there are hieroglyphics in Toniná that record a new defeat of Palenque.
During the 8th century, the Maya city-state of B'aakal came under increasing stress, in concert with most other Classic Maya city-states, and there was no new elite construction in the ceremonial center sometime after 800. An agricultural population continued to live here for a few generations, then the site was abandoned and was slowly grown over by the forest. The district was very sparsely populated when the Spanish first arrived in the 1520s.