Sir John Denham was an English-born judge who spent part of his career in Ireland. He is chiefly remembered now as one of the "Ship-money judges" who decided the so called Ship Money case, Rex v. Hampden. He was the father of the poet Sir John Denham.
In 1617 Denham returned to England to take up office as a Baron of the Exchequer. As such he was one of the judges in the celebrated Case of Ship Money, Rex v. John Hampden, which concerned the prerogative of the King to levy the tax on his simple assertion that a need for it existed. When King Charles I in 1636 first consulted the twelve High Court judges on his power to levy ship money, Denham was one of ten of them who advised that it was the King's royal prerogative to determine whether the national good required the imposition of the tax. By the time the case of John Hampden was heard by the Court of Exchequer in 1637, Denham is known to have been increasingly doubtful about the legality of ship money; indeed it was due to Denham's doubts that the Lord Chief Baron, Sir Humphrey Davenport, decided to remove the case to the Court of Exchequer Chamber, where it would be heard by twelve rather than the usual four judges. When the twelve came to give judgement, Denham was one of the five who voted in favour of Hampden. Although he was then so ill "of my old disease", that he could not leave home, he sent in a short opinion that "the King's Majesty..... can neither take any lands or goods of any of his subjects but only upon a judgment on record." Had he lived longer his opinion would very likely have saved him from being impeached, as most of his surviving colleagues were; in the event he died at his home at Egham, Surrey, the following year.
Family
Denham married firstly Cicely, widow of Richard Kellefet of Egham, a Groom of the Royal Bedchamber, and secondly Eleanor Moore, daughter of Garret Moore, 1st Viscount Moore, by his wife Mary, daughter of Sir Henry Colley. He and Eleanor had one son, the celebrated poet Sir John Denham. His son's passion for gambling is said to have caused him a good deal of worry in his last years: the younger John, who was still living with his parents, was by then married to Ann Cotton,and had a growing family. He is said to have squandered several thousand pounds on gaming. Denham and both his wives were buried at St. John's Church, Egham: the present St John's Church is a much later structure.