When Wentworth was made
Lord Deputy of Ireland, Radcliffe, in January 1633, preceded him to that country, and having been made a member of the
Privy Council of Ireland he was trusted by the Deputy in the fullest possible way, his advice being of the greatest service. Wentworth wrote that of all the Privy Council, he confided only in Radcliffe and
Christopher Wandesford, whose services to him could never be adequately rewarded. It was Radcliffe who persuaded Strafford to mend an early quarrel with
James Butler, 1st Duke of Ormonde, arguing rightly that Ormonde would be a friend and ally of immense value. On the other hand, he and Strafford showed very poor judgement in their campaign of harassment against the powerful magnate
Richard Boyle, 1st Earl of Cork, who became an implacable enemy of Strafford, and worked patiently over the years for his ruin. Radcliffe sat in the
Irish House of Commons as member for
County Armagh in the Parliament of 1634–35 and for
County Sligo in the Parliament of 1639–41, and was farmer of the customs revenues. He also acquired substantial lands in
County Fermanagh and
County Sligo. When Strafford returned to England in 1639, he entrusted Radcliffe with the management of Ireland's finances and also Strafford's own tangled financial affairs. Radcliffe built
Rathmines Castle near Dublin: it was destroyed during the wars of the following decade but rebuilt in the eighteenth century. In 1640, Radcliffe, like Strafford, was arrested and
impeached, but the charges against him were not pressed. He was freed in 1642, and in 1643 he was with
Charles I at
Oxford. He remained loyal to Strafford's family, and used his extensive knowledge of his master's financial affairs to salvage something for his widow and children. ==Exile ==