The Nuttall Encyclopedia
A boy chosen on 6th December, St. Nicholas' Day, generally out of the choir, to act as bishop and do all his episcopal duties, except celebrate mass. For the term of his office, which varied, he was treated as bishop, and if he died during his tenure of it was buried with episcopal honours. The term of office was limited in 1279 to 24 hours.
Wood, James, ed. Entry for 'Boy Bishop'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/b/boy-bishop.html. Frederick Warne & Co Ltd. London. 1900.