Monmouth School is an HMC boys' boarding and day school in Monmouth, Monmouthshire in south east Wales. It was founded in 1614 by William Jones. It is run as a trust, the William Jones's Schools Foundation, by the Worshipful Company of Haberdashers, one of the Livery Companies. On 19 March 2014, some 1,200 pupils and staff from the school, and from Haberdashers' Monmouth School for Girls, celebrated the four hundredth anniversary of the foundation of Monmouth School with a service of thanksgiving at St. Paul's Cathedral.