Portugal (1977 SG1656/1657) Pedro Hispano.

Pedro Hispano (1215-1277) was born in Lisbon as Petrus Juliani. He studied medicine in Paris and became professor
of medicine at Siena University in Italy. He had a special interest in ophthalmology and wrote a book on ophthalmology 
Liber de Oculo. From 1272 to 1275, he served as the bishop of Braga in the Northern Portugal. In 1276, he became the 
first Portuguese pope and took the name of Pope Johannes XXI.