In English they are commonly called "Charterhouses," from the French name for the location of their first foundation, in the mountainous area of the "La Chartreuse".

The government was at first anxious to secure the public acquiescence of the monks of the London Charterhouse regarding royal supremacy in ecclesiastical matters; since for the austerity and sincerity of their mode of life they enjoyed great prestige.

[2] They resolved to go together to Cromwell, the King's Vicar-General, to represent their sincere loyalty, but to petition to be exempted from a requirement that would violate their conscience.

Sometime around the middle of April 1535, Webster, and fellow Carthusians, Houghton and Lawrence were imprisoned in the Tower on the orders of Thomas Cromwell for refusing to take the Oath of Supremacy.

There are stained-glass windows of the martyr in the following churches: St. Augustine Webster Catholic Voluntary Academy in North Lincolnshire is named after him.