Paul succeeded his first wife's grandfather as Clerk of the Privy Council, partly due to the premature death of his own father-in-law Arthur Ussher, who was Deputy Clerk and would no doubt have succeeded his father, but who
drowned trying to ford the
River Dodder in south
County Dublin during the great
flood of 1628. Paul seems to have been an able and conscientious official; Ball refers to his "long and painful service" as Clerk. He was elected to the
Irish House of Commons as member for
Enniskillen in the Parliament of 1634, and for
County Donegal in that of 1639. He was in favour with the all-powerful
Lord Deputy of Ireland,
Thomas Wentworth, 1st Earl of Strafford; more importantly, he gained the lifelong friendship of the Duke of Ormonde, who did all in his power to advance the career first of Davys, and later of his sons. No doubt through Ormonde's influence, he became Principal Secretary of State for Ireland, in
reversion to Sir
Philip Mainwaring. After the downfall of the
Royalist cause in Ireland, Davys might have been expected to retire into private life. In fact, he seems to have retained some political influence under the Commonwealth, and is said to have been close to
Henry Cromwell. Rumours about his loyalty were certainly widespread enough for his friend Ormonde, at the
Restoration, to defend Davys as one who had "ever been loyal to the true cause". These doubts about his loyalty did not hinder his post-Restoration career: he sat in the House of Commons for
County Kildare in the Parliament of 1661, received large grants of land, mainly in
County Donegal, and became a member of the Privy Council. On the death of Sir
Philip Mainwaring in 1661, Davys who already held the
reversion to the office, became Secretary of State. There appear to have been complaints about his slowness and inefficiency in the role of Secretary, since Ormonde, rather defensively, argued that his "old-fashioned" ways were suited to Ireland. He retained office until his death in 1672; in his last years, he was probably living at his son William's house at St. Catherine's Park, in
Leixlip, County Kildare. He died on 7 December 1672, and was buried in
St. Audoen's Church, Dublin. ==Family==