On 9 July 1785, Montagu married Elizabeth Charlton, daughter and heir of Francis Charlton of Kent. Before her death, they had six sons and seven daughters, including: • Edward Montagu, 5th Baron Rokeby (1787–1847), who died unmarried in
Naples. • Hon. Elizabeth Montagu (d. 1875), who married Charles Oldfield Bowles, son of Oldfield Bowles, in 1815. He was succeeded in his titles by his eldest son,
Edward. Upon Edward's death in
Naples in 1847, the titles passed to his younger son
Henry upon whose death the baronetcy and barony became extinct. ==References==