On October 12, 1761, Amat succeeded
José Manso de Velasco, 1st Count of Superunda as
Viceroy of Peru. He was followed by
Manuel de Guirior, Marqués de Guirior on July 17, 1776. In September 1767, he executed the
expulsion of the Jesuits missionaries from the
Viceroyalty of Peru, following orders from the Crown. He established the first Regulation of Commerce and Organization of Customs rules, which led to the building of the customshouse in Callao. He had the fortress of Real Felipe constructed in
Callao, being finished in 1774. He founded the Royal College of San Carlos. He constructed various public works in Lima. Probably the most famous are the
Alameda de los Descalzos and the
Paseo de Aguas, in the district of
Rímac. He also remodeled the
Alameda de Acho. Also under his administration, the Plaza de Toros de Acho, the world's third oldest surviving bull ring, was built by Agustin de Landaburu. It was the first bull ring in Peru, and opened with a
corrida and a great celebration on February 22, 1762. Tradition says the Paseo de Aguas was built in honor of Amat's mistress, the actress
Micaela Villegas, better known as
La Perricholi, a
Mestiza woman. The story is that when the viceroy asked her to become his mistress, she replied that she would when he laid the moon at her feet. Amat y Junient then ordered the construction of the Paseo de Aguas in front of her house. It is an aqueduct from the
Rímac River with a fountain and a long, narrow reflecting pool, with a promenade along the sides of the pool. The night of the following full moon, he invited her to view it with him. ''La Perricholi's
life inspired painters, writers and musicians. It provided the basis for the Prosper Mérimée comic novella Le Carrosse du Saint-Sacrement
, which in turn was the basis for both the Jacques Offenbach opéra bouffe La Périchole and the Jean Renoir 1953 film Le Carrosse d'or (The Golden Coach
). She and the viceroy are also prominent characters in the Thornton Wilder novel The Bridge of San Luis Rey''.
Expeditions To avoid the establishment of foreign bases from which attacks could be launched on Peru, Amat organized an expedition under the command of
Domingo de Bonechea to
Tahiti, which arrived just after that of Captain Cook, but in time to explore other islands in the group which Cook had not discovered. In subsequent voyages ordered by Amat, de Bonechea was the first European to explore most of
French Polynesia. Amat also sent an expedition under
Juan Antonio de Buenechea to search for the doomed ship
Oriflama, piloted by his kinsman Manuel de Buenechea. ==Last days==