Ley was elected as
Member of Parliament for
Westbury in 1597. In 1603, he was appointed a judge on the
Carmarthen circuit. That November he became a
serjeant-at-law and in December
James I knighted him: the King formed a high opinion of his abilities. He was elected MP for Westbury again in 1604, and then King James sent him to Dublin as
Lord Chief Justice of the King's Bench for Ireland. He also served on the
Privy Council of Ireland, and was a Commissioner for the
Great Seal of Ireland in 1605. He entered the
King's Inns, which had been virtually in abeyance, in 1607, and did much to restore its status as a professional body. He was diligent in his official duties, and was the first judge to hold an
assize in
Wicklow. Amongst other things, he caused the English
Book of Common Prayer to be translated into Irish and sought to enforce Protestant
church attendance on the Irish Catholic nobility. As a result, he became highly unpopular, and a flood of complaints went back to England concerning the severity of his administration. Ley was called back to England in 1608, ostensibly to brief the
English Privy Council on the
settlement of Ulster. He was then appointed to the lucrative post of Attorney-General of the
Court of Wards. Further promotion came slowly. He was a member of Parliament for Westbury again in 1609–1614 and was elected MP for
Bath in 1614. He was made a baronet in 1619. In 1621 he was made an English judge at Westminster when he became
Lord Chief Justice. He was elected MP for Westbury again in 1621, but was required to preside in the
House of Lords following the disgrace of
Francis Bacon, though he was not made
Lord Chancellor, despite reportedly offering £10,000 for the office. The same year he married his third wife Jane Boteler, niece of the prime
royal favourite Buckingham. Late in 1624, through the influence of Buckingham, Ley replaced
Cranfield as
Lord High Treasurer, also being sworn as a Privy Councillor. He was created
Baron Ley, and then in 1626
Earl of Marlborough. His treasurership was hampered by
Charles I's financial difficulties, and his own lack of experience in the world of finance. He retired from this in 1628, and from July until December of that year he was
Lord President of the Council. However, he soon retired to Lincoln's Inn and died the following March. He was remembered as a poor statesman but an able and impartial judge. ==Other achievements==