GILBERTYN. Gilbertus Anglicus or Gilbert the Englishman, fl. A.D. 1250, was active at Montpellier. Of his many medical treatises, his most famous was the Compendium medicinae, containing detailed pathological descriptions of such diseases as leprosy and smallpox. He was the first physician to establish that smallpox is contagious and the first to write on the hygiene of travel. Merton College Library owned a copy of this work between 1360 and 1385.

The Doctor claims to know Gilbertyn's work, Gen Prol 434.

The name appears in final rhyming position, which perhaps has determined its form.