Bankes was of the Bankes family of Keswick, Cumberland. He matriculated at Queen's College, Oxford on 22 February 1605 aged 15. He entered Gray's Inn, where he was called to the bar in 1614. In 1624, he was elected Member of Parliament for Wootton Bassett. He was elected MP for Morpeth in 1626 and in 1628 and sat until 1629 when King Charles decided to rule without parliament for eleven years. In about 1618 he married Mary Hawtrey, by whom he had ten children, four sons and six daughters. In 1630, Bankes was Lent Reader of Gray's Inn and was treasurer to the Inn from 1631 to 1635. He was knighted at St James on 5 June 1631. He was also appointed attorney to Prince Charles. In September 1634 he became attorney-general to the king, holding this position during the litigation of John Hampden's famous cause of ship money; and his argument upon that question is still extant. He was also counsel for Cambridge University in 1634–35.
Corfe Castle
Bankes purchased Corfe Castle with all its manors, rights, and privileges in 1635 from Lady Elizabeth Coke, widow of Sir Edward Coke, who had died in 1634. Bankes's ancestors had for many generations held property in and near Keswick in Cumberland. The Title deeds and grants from the Crown of the black lead mine at Borrowdale date back as far as Henry VI. and Edward IV and were again renewed under the seal of James I.
In January 1640 he was made Chief Justice of the Common Pleas, and afterwards followed the king from Westminster to York; having left his wife, Mary Bankes, to defend Corfe Castle, which she did with great courage, until it was betrayed into the hands of the rebels. His name is signed to the engagement with the lords at York, in June 1642. In the same year he was sworn of the privy council, and the degree of LL.D. conferred upon him at Oxford, where he died on 28 December 1644, aged 55, and was buried in the Cathedral of Christ Church, where there is a monument to his memory. In 1644, he was at first mentioned in the list of those persons meant to be excepted out of the general pardon; his name was afterwards struck out of that list, but he was notwithstanding impeached of high treason. His estates and property however passed to his eldest son Sir Ralph Bankes, who became an MP and built the estate of Kingston Lacy.
