Thomas Barclay was born in Aberdeen and died in Toulouse on 4 December 1632. He came from Aberdeen diocese and probably studied at King's College before proceeding to Paris, where he enrolled on graduating MA in 1589. From there he went to lecture in humanities and philosophy at Bordeaux under Robert Balfour, before taking up a post as lecture in rhetoric at Toulouse University, probably in 1591. He turned to lecturing in philosophy, which was a popular course, and was Principal of the Collège de l'Esquile from 1596 to 1608. In 1606 he became doctor regent in law, canon and Civil, at Toulouse, followed in 1609 by his brother Patrick. At some point, probably in 1596 or 1614, he went to profess law at Poitiers, where the library of the Avocats contains his dictated treatise ‘ad Tit XIII, lib III, decret, Greg IX de rebus ecclesie alienandis, vel non’. He was also employed by Poitiers in 1614 to defend its rights in Paris. In 1614 James Kidd (who styled himself Cadanus), Professor of Law, died in late December, and the Parlement of Toulouse decided that Barclay should succeed him, a decision the University contested, although on a University vote Barclay was in fact chosen as Royal Professor on 28 February 1615.
From The Continuum Encyclopedia of British Philosophy in Oxford Reference.