Petrus de Ibernia

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Petrus de Ibernia, also known as Peter of Ireland, was a writer and lecturer who is said to have taught logic and natural philosophy to Thomas Aquinas.[1][2]


Peter lectured in natural philosophy at the University of Naples during Thomas Aquinas's term of attendance (1239–1244). He was the author of 'Determinatio magistralis', "on the question that the bodily organs have been created in order that they might carry out their functions, of the functions, created for the benefit of the organs." Peter felt this question to be purely a metaphysical one, despite his vocation being natural philosophy.

In 1260 he presided over a dispute on physics held before Manfred of Sicily.

Peter of Ireland studied Moses Maimonides with a Jewish–Christian group in the 1250s.[1]

His works

Works attributed to him include


  • Clemens Baeumker, Petrus von Hibernia der Jugendlehrer des Thomas von Aquino unde seine Disputation vor König Manfred, Munich, 1920.
  • – p. 960-61, A New History of Ireland, volume one.


  1. 1.0 1.1 "Peter of Ireland, Teacher of Aquinas". Irish Philosophy. Retrieved June 8, 2020.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. "Peter of Ireland, the University of Naples and Thomas Aquinas' Early Education" (PDF). Yearbook of the Irish Philosophical Society. 2006: 84. S2CID 160634587. Retrieved June 8, 2020.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>