Beresford was effectively in charge of Portugal from 1814-1820

Wellington left Portugal in May 1813, for the last time, but was kept fully informed of events by Beresford, who was effectively in charge of Portugal until 1820, growing increasingly unpopular in the process, partly because he inflated the size of the Portuguese army to 60,000 out of a total population of only three million, often forcibly recruiting agricultural workers. Beresford made two voyages to Rio de Janeiro, the first in 1815-16 and the second in 1820. On his return from the second trip he found the country in the hands of a revolutionary junta, which would not let him land and dispatched him to England.

For more information, please see:

Wellington and Beresford: Portugal and Brazil