Willem Nicolaysen Gran (monastic name: John; 5 April 1920 – 20 March 2008) was the bishop of the Roman Catholic Diocese of Oslo from 1963[1] to 1983.
During World War II, Gran did military service, first stationed in London and then in peacetime he was posted in Norway, where in 1945-1946 he was a liaison officer at Akershus Fortress.
During 1946–7, after discharge, he worked in the film industry as assistant director on Operation Swallow, which documented the Norwegian heavy water sabotage.
Gran felt an attraction to the monastic life, and in November 1949 he entered the Cistercian Trappist monastery on Caldey Island off the coast of Pembrokeshire in Wales.
After theological studies at the monastery of Scourmont in Belgium, he was ordained a priest in Caldey Abbey in 1957 by Bishop Theodor Suhr OSB from Copenhagen.