Background
Herbert was the son of William Herbert of Coldbrook.
Herbert was the son of William Herbert of Coldbrook.
He fought in the Parliamentary army in the English Civil War. He matriculated at Magdalen Hall, Oxford on 10 October 1634 and entered Middle Temple in the same year. He was a colonel in the Parliamentary army and took Cardiff in September 1645 and then Swansea.
He was one of the parliamentary commissioners for Monmouthshire in 1646 and took a prominent in the Commonwealth.
He was appointed Commissioner of Militia for Monmouthshire on 14 March 1654. In 1654 he was re-elected Member of Parliament for Monmouthshire in the First Protectorate Parliament.
He was given £3000 and the plunder of Raglan Castle. Herbert married Mary Rudyard, daughter of John Rudyard, grocer of London.
In March 1642, Herbert was elected Member of Parliament for Monmouthshire in the Long Parliament. He was appointed a member of High Court of Justice on 25 June 1651. He was a member of 4th Council of State from 19 November 1651 to November 1652 and was placed on the committee of law and the committee for preserving of timber on 2 December 1651.