Carthusian Martyrs of London were canonized by Pope Paul VI in 1970. There is a memorial plaque at Charterhouse Square. A private commemoration ceremony takes place each year at the Carthusian martyrs plaque on 4 May, the date of John Houghton's execution. There are paintings of four of the Carthusian martyrs - Blessed William Exmew, Blessed Thomas Johnson, Blessed Richard Bere, and Blessed Thomas Green - at the Certosa di Bologna. Vincente Carducho was employed by the monks of the Chartreuse of el Paular to decorate the great cloister with 54 canvases of historical figures. Twenty-seven represent the life of St. Bruno, twenty-seven are
Denis the Carthusian the fingers he had most used in writing, i.e. the thumb and forefinger of the right hand, were found in a perfect state of preservation. Although the cause of his beatification has never yet been introduced, St. Francis de Sales, St. Alphonsus Liguori, and other writers style him "Blessed"; his life is in the Acta Sanctorum of the Bollandists (12 March), and his name is to be found in many martyrologies. The great contribution of Denys the Carthusian was to synthesize all previous doctrine on the spiritual life and then to make an evaluation of the various conclusions. He wrote