Howth's first wife Margaret was a daughter of Sir
Christopher Barnewall of Turvey, who while outwardly conforming to the
Church of Ireland, had privately adhered to the Roman Catholic faith. Christopher's son
Patrick Barnewall emerged in the early 1600s as a spokesman for the Catholic nobility. Although the brothers-in-law had been on bad terms in the 1590s, when they were engaged in a
lawsuit, Barnewall and Howth later became friendly and Howth, like Barnewall, openly professed his Catholic faith, as did Howth's son-in-law, Lord Gormanston. In December 1605 Howth and Barnewall were signatories to a petition that the
Penal Laws should be modified, rather than extended. This was a risky step to take, particularly just after the discovery of the
Gunpowder Plot, and Barnewall was sent to the
Tower of London as a result, but Howth was left in peace. He enjoyed the confidence of yet another Deputy, Sir
Arthur Chichester, who was said to openly dispute with him the rival merits of the two faiths (their friendship is rather surprising, in view of Chichester's hostility to Catholics, and his vigorous enforcement of the
Penal Laws). Possibly to forestall any action against Howth, Chichester wrote that he was old and would probably not live long. This prediction proved to be correct: Howth died in May 1607 and was buried in Howth Abbey. To his heir, he left an estate heavily encumbered by debt. == Family ==