1591. He became JP from 1592 and was governor of mineral and battery works in 1593. Also in 1593 he was elected MP for Bletchingley. He was treasurer of the Inner Temple in 1593. He became Master of Requests Ordinary of Court of Requests in 1595 and Master of St Katherine's Hospital in 1596. In 1597 he was elected MP for Windsor and was re-elected MP for Windsor in 1601. Queen Elizabeth, on her way to Nonsuch Palace, paid him a visit at his house at Mitcham on 12 September 1598. She spent the night of the 12th there, and dined with him the next day. In the reign of King James, Caesar acquired extensive property, particularly in Hertfordshire, and achieved greater influence and political importance. He was knighted at Greenwich by King James in May 1603. He also became ecclesiastical commissioner for the Province of Canterbury in 1603. In 1606 he was elected MP for Middlesex. He was Chancellor and Under Treasurer of the Exchequer from 1606 to 1614. In 1607 he was appointed to the Privy Council. In 1614 he was appointed Master of the Rolls, an office which he held till his death in 1636. He was re-elected MP for Middlesex in 1614. In 1621 he became first commissioner for the great seal and was elected MP for Maldon. He was commissioner to inquire into operation of the poor law from 1631 to 1633. Death Caesar died at the age of 79 and was buried at Great St. Helen's, Bishopsgate. Legacy Caesar was a remarkable civil servant and left many volumes of papers relating to his official work, and others relating to the mint, of which his first father-in-law was master. He worked on the history of the Exchequer, and presented to Burghley a history of the Court of Requests "to defend it against the slights of the common lawyers". In 1625 he wrote a treatise on the constitution and functions of the privy council, entitled Concerning the Private Council of the Most High and Mighty King of Great Britain, France, Scotland, and Ireland. His manuscripts, many of which are now in the British Museum, were sold by auction in 1757 for a sum of around £500. Personal life Caesar married three times. He married firstly Dorcas Lusher (1561 – 16 June 1595), widow of Richard Lusher of the Middle Temple and daughter of Sir Richard Martin,