権利の請願
In early 1628, he was elected MP for Warwick, a session dominated by the struggle over the Petition of Right. His election was challenged and voided on 31 May but before a by-election could take place, his adoptive father died on 30 September. Greville inherited his titles and thereafter sat in the House of Lords. Many contemporaries resented his alleged low social origins, while his religious radicalism also set him apart.