Monson’s father, a courtier, was an adherent of the Howard faction at Court, and suspected of Catholicism.
Monson was returned to the first Caroline Parliament for Lincoln, some two miles from his home. He left no trace on its records. A year later he was elected knight of the shire for Lincolnshire, and may have helped his uncle, Sir Robert*, to obtain a seat in his former constituency. Ahead of the opening of the Parliament, he received a knighthood of the Bath at Charles I’s coronation. On 17 Feb. 1626 he moved for an inquiry into the case of Sir Robert Howard*, who had been excommunicated notwithstanding his parliamentary privilege, and was named to the ensuing committee.
During the 1630s Monson formed a consortium to drain the Ancholme level, ‘in such indifferent ways as will rather advantage the country than bring any benefit to himself’, a statement not easy to credit since he was able to add 5,827 acres to his estate.
Monson spent the Civil War almost entirely at the royalist headquarters in Oxford, and helped to negotiate the surrender in 1646.
During the exclusion crisis Monson published A Discourse Concerning Supreme Power and Common Right.
