The son of the richest commoner in Hampshire, Wallop was first returned at a by-election for Andover in 1621 while still under age, and was re-elected to every subsequent Parliament until the Restoration, either for the borough or the county. Nevertheless, so far as is known, he was totally inactive in Parliament throughout the period before 1640.
Although his father was prepared to give him a free choice, Wallop made a very advantageous marriage to the daughter of Hampshire’s lord lieutenant.
