He was General of the galleys in Hispaniola, and in 1635 led an attack on buccaneers who had settled on Tortuga, expelling them from the island for several years.
[2] Fuenmayor returned to Spain, and on 26 November 1636 was appointed Governor and Captain-General of Venezuela Province, arriving there in 1637.
In 1637 he arranged for transfer of the seat of the bishop of Venezuela from Santa Ana de Coro to Caracas.
He arranged for the fort of La Guaira, which had been destroyed by the earthquake, to be quickly rebuilt.
[1] Fuenmayor finished his term in office in 1644, and was succeeded by Marcos Gedler y Calatayud.