For the Long Parliament, which met on the 3rd of November 16 4 0, he was elected for Downton in Wiltshire, but the return was disputed, and he did not take his seat - his election not being declared valid until the last days of the Rump. He was present as a spectator at the setting up of the king's standard at Nottingham on the 25th of August 1642; and in 1643 he appeared openly on Charles's side in Dorsetshire, where he raised at his own expense a regiment of foot and a troop of horse, of both of which he took the command.
He was afterwards appointed professor ordinarius of philosophy at Kiel (1873), and in 1878 he was elected to the philosophical chair at Tubingen.
He was elected a deputy of the nobility to the states-general, where he sat alongside of his friend La Fayette.
Elected a member of the Versailles assembly, he resigned his mandate in anger at French insults, and withdrew to Caprera until, in 1874, he was elected deputy for Rome.