Henry Howard appears to have left England in the spring of 1679, probably because of heightened anti-Catholic tensions caused by the Popish Plot.
As the Catholic son of a Catholic martyr, it was only to be expected that Stafford would himself sympathize with the efforts of James II to introduce the Catholic religion into England. At the revolution of 1688 he followed his king into exile, and in the spring of 1689 he was appointed ambassador to the king of Spain by the exiled James II, but according to Roger Morrice he was refused an audience.
By 1690 Stafford and his mother had used Stafford Castle and other lands in England to fund the celebration of masses for the martyred viscount and to begin the process of canonizing him.
By 1694 Stafford was living at the Hague and had obtained a passport from the elector of Bavaria.
Stafford’s whereabouts after 1699 are uncertain. Although he appears to have spent some time in England, by 1704 he was said to be living in Brussels.
