John Robartes was born in
Truro, where his father Richard Robartes was knighted in 1616, created a baronet in 1621 and raised to the peerage as Baron Robartes of Truro in 1625. The family had amassed wealth by trading in tin, wood and gorse (furze) used by the tin smelters, and in 1620 bought and began extending
Lanhydrock House near Bodmin as the family seat. Richard became a baronet, and the baronet's hand on the shields engraved on the principal door of Lanhydrock House bear testimony to this. The barony was purchased for £10,000 in 1625. This ennoblement was claimed, by the opponents of the Duke of Buckingham, to have been purchased under compulsion. His son, John, was the first of the family to receive a university education, being educated at
Exeter College, Oxford. His father became the friend of
Robert Rich, 2nd Earl of Warwick, and succeeded in arranging the marriage of his son to the Earl's younger daughter Lucy, thereby cementing an alliance that would bring John into contact with influential radical preachers of the time. Convinced of the more
Calvinist doctrines of the Church of England, John became alarmed at the
Arminian slant of King
Charles I's religious policy and his increasingly autocratic rule; he believed the King had been misled by evil councillors. For this reason John Robartes fought on the side of the
Parliament and, according to his view of things, also the King, during the
Civil War. He fought with valour at the
Battle of Edgehill on 23 October 1642, and at the
First Battle of Newbury, on 20 September 1643. He became a member of the Committee of Both Kingdoms. This Committee, on which his mentors, the Earls of Warwick and Essex, also sat, allowed him to appreciate Scottish Presbyterianism. He always relied on his own interpretation of the Bible; annotations he made in his books show that he sympathised with those who put faith above ritual. He had succeeded his father, Richard Robartes, as
Baron Robartes in May 1634. He is said by some, especially
William Sanderson, to have persuaded the
Earl of Essex to make his ill-fated march into
Cornwall in 1644; he escaped with the earl from
Fowey after the defeat of the parliamentary army in the first days of September 1644. Having reached
Plymouth safely, he became its Governor and defended the city from the besieging Royalists. With the
Self-Denying Ordinance of April 1645 he lost his command in Plymouth and was obliged like his brother-in-law, the
Earl of Manchester, to watch the successes of Cromwell's
New Model Army from the sidelines. He, like other Lords who had sided with Parliament, was marginalised by the so-called Independents who saw no future in continuing negotiations with King Charles. The execution of the King would have appalled him. ==Later life and death==