 Maynard favoured the impeachment of Edward Fitzharris, declared its rejection by the House of Lords a breach of privilege (26 March 1681), and took part in the subsequent prosecution in the king's bench.In the action for false imprisonment during his mayoralty brought by Sir William Pritchard against the ex-sheriff Thomas Papillon on 6 November 1684, an incident in the conflict after the court took on the liberties of the City of London, Maynard conducted the defence with eminent skill and zeal, though a Jeffreys-ridden jury found a verdict for the plaintiff with £10,000 damages.Summoned to give evidence on behalf of Oates on his trial for perjury in May 1685, and questioned concerning the impeachment of Lord Stafford, Maynard pleaded total inability to swear to his memory in regard to that matter, and was dismissed by Jeffreys with a sneer at his supposed failing powers.