"El Adelantado" was appointed governor of Honduras and then of Chiapas. Therefore, he gave his son "El Mozo", the mission to consummate the conquest of Yucatán. Francisco de Montejo y León "el Mozo" founded the cities of San Francisco de Campeche on October 4, 1540, and Mérida on January 6, 1542 (in honor of Mérida, Extremadura). The city of Mérida was founded over the ruins of the Mayan city of Ichkanzihóo (T'ho) and the stones of old Mayan pyramids were used for the new buildings. Later, government powers were changed from "Santa María de la Victoria", Tabasco, to Mérida on June 11, 1542. The newly founded Mérida was besieged by the Mayan troops of Nachi Cocom (overlord or 'Halach uinik' in Mayan language). It was a definitive battle for the Conquest of Yucatán. With that victory, the Spaniards consolidated their control of the western part of the peninsula.