John of Wales (died c. 1285), also called John Waleys and Johannes Guallensis, was a Franciscan theologian who wrote several well-received Latin works, primarily preaching aids.
[1] Born between 1210 and 1230, almost certainly in Wales, John joined the Franciscan order, and incepted in theology at the University of Oxford sometime before 1258.
He was a moral theologian and a great admirer of the ancient world, incorporating many classical authors into his works.
[1] The above works were printed together in an incunabulum edition (Venice, 1496) under the title Summa de regimine vitae humanae, seu Margarita doctorum.
John also composed a number of other theological works, including a guide to preaching (Ars praedicandi), sermons, and Biblical commentaries.