Aglionby claimed descent from a Norman settler who gave his name to a village some three miles east of Carlisle. His ancestors regularly represented the city from 1368, and his father sat in two Elizabethan Parliaments.
Aglionby was ineligible to stand at the general election in 1626, at which time he was serving his fourth term as mayor of Carlisle, but as the town’s returning officer he secured the election of his kinsman, the courtier Richard Graham*. On 7 Apr. 1626 Aglionby petitioned the Privy Council on behalf of the city for the repair of two bridges over the river Eden, as required by a statute of 1601.
