Carl Johan Frederik Jakhelln (27 August 1914 – 25 April 1987) was a Norwegian diplomat and writer. He was born in Andenne, Belgium, as the son of jurist and diplomatist Johan Fredrik Winter Jakhelln. The family lived in five countries when Jakhelln was young, and he took his first higher education at Sorø Academy before moving to Norway. While a student at the University of Oslo, he was arrested for "spying" in 1941 during the German occupation of Norway. He was imprisoned at Møllergata 19 from 31 March to 28 June, and then in Grini concentration camp until November. He was then incarcerated in Sachsenhausen concentration camp until the war's end in May 1945. Here he led a social life with prisoners of several nationalities. He was known for making crossword puzzles, quizzes and other past