Peter of Limoges ( la, Petrus Lemovicensis or '; french: Pierre de Limoges; – 1306) was the author of ''A Moral Treatise on the Eye'' ( la, Tractatus Moralis de Oculo) or ''On the Moral Eye'' ('), a popular guide for

Catholic The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...

priests A priest is a religious leader authorized to perform the sacred rituals of a religion, especially as a mediatory agent between humans and one or more deity, deities. They also have the authority or power to administer religious rites; in p ...

, composed at the

University of Paris , image_name = Coat of arms of the University of Paris.svg , image_size = 150px , caption = Coat of Arms , latin_name = Universitas magistrorum et scholarium Parisiensis , motto = ''Hic et ubique terrarum'' (Latin) , mottoeng = Here and a ...

sometime in the 1270s or '80s. The work depended heavily on

Roger Bacon Roger Bacon (; la, Rogerus or ', also '' Rogerus''; ), also known by the scholastic accolade ''Doctor Mirabilis'', was a medieval English philosopher and Franciscan friar who placed considerable emphasis on the study of nature through empiri ...

's earlier treatment of

optics Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviole ...

. Peter of Limoges was the friend of Robert de Sorbonne and also taught at the

University of Sorbonne The University of Paris (french: link=no, Université de Paris), Metonymy, metonymically known as the Sorbonne (), was the leading university in Paris, France, active from 1150 to 1970, with the exception between 1793 and 1806 under the French Revo ...

. He was a disciple of

Ramon Llull Ramon Llull (; c. 1232 – c. 1315/16) was a philosopher, theologian, poet, missionary, and Christian apologist from the Kingdom of Majorca. He invented a philosophical system known as the ''Art'', conceived as a type of universal logic to pro ...

.Anthony Bonner (ed.), ''Doctor illuminatus: A Ramon Llull Reader'', Princeton University Press, 1993, p. 82. He may be identical to the Peter of Limoges who was the first known dean of the faculty of medicine at the

, attested in 1267 and 1270.

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