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 Viceroy of Peru

Manso de Velasco was the viceroy of Peru during the reign of Ferdinand VI of the House of Bourbon, holding the office from 1745 to October 12, 1761. He succeeded José Antonio de Mendoza Caamaño y Sotomayor and was replaced by Manuel de Amat y Juniet. The most important event of his tenure was the great earthquake of 1746.

On October 28, 1746 at around 10:30 at night, a major earthquake struck Lima and vicinity, resulting in one of the highest number of deaths for such an event in the area. Witnesses differ on the duration of the event, with reports ranging from 3 to 6 minutes. The intensity of the quake is today estimated at 10 or 11 on the Mercalli scale. The aftershocks, by the hundreds, continued for the following two months.

In Lima, the destruction was severe. Of 60,000 inhabitants, 1,141 were reported to have died. Only 25 houses remained standing. In Callao, a tsunami of nearly 17 meters in height penetrated up to 5 kilometers inland leaving only 200 survivors out of a population of 5,000. The fact that the earthquake struck at night probably contributed to the casualties, as many people were caught asleep in their homes. In the wake of the disaster, the population was gripped by hunger and fear.

As a result of this earthquake, building practices were modified, with the adobe style abandoned for quincha (wattle and daub) construction techniques, which resulted in more flexible structures that were more resistant to disruptive seismic activity.

On February 10, 1747 he founded the city of Bellavista. On May 30, 1755 the cathedral of Lima was begun.