John of Gaddesden

John of Gaddesden (1280–1361) was a medieval English physician. He wrote a treatise on medicine titled Rosa Medicinae (The Rose of Medicine), also called Rosa Anglica ("The English Rose"), between 1304 and 1317, considered to be the first English textbook of medicine. John of Gaddesden was also a Roman Catholic theologian, a fellow at Merton College, Oxford, a physician for members of the British royal family, and one of the most celebrated medical authorities of his time. His medical works, alongside those of Gilbertus Anglicus, "formed part of the core curriculum that underpinned the practice of medicine for the next 400 years".