At the beginning of the 19th century, the Spanish took steps to permanently settle and secure the island. In 1811, Don Salvador Meléndez, then governor of Puerto Rico, sent military commander Juan Rosselló to begin what would become the annexation of Vieques by the Puerto Ricans. In 1832, under an agreement with the Spanish Puerto Rican administration, Frenchman Teófilo José Jaime María Le Guillou became Governor of Vieques, and undertook to impose order on the anarchic province. He was instrumental in the establishment of large plantations, marking a period of social and economic change. Le Guillou is now remembered as the "founder" of Vieques (though this title is also sometimes conferred on Francisco Saínz, governor from 1843 to 1852, who founded Isabel Segunda, the "town of Vieques", named after Queen Isabel II of Spain). Vieques was formally annexed to Puerto Rico in 1854.