The principal works of Gregory Thaumaturgus are the Panegyricus in Origenem (Eis 't ptybniv iravrnvpucos Xbyos), which he wrote when on the point of leaving the school of that great master (it contains a valuable minute description of Origen's mode of instruction), a Metaphrasis in Ecclesiasten, characterized by Jerome as " short but useful "; and an Epistola canonica, which treats of the discipline to be undergone by those Christians who under pressure of persecution had relapsed into paganism, but desired to be restored to the privileges of the Church.
Another of his works, Recensio canonica effectionum geometricarum, bears a stamp not less modern, being what we now call an algebraic geometry - in other words, a collection of precepts how to construct algebraic expressions with the use of rule and compass only.
In the Cluniac circle was coined the principle: Canonica auctoritas Dei lex est, canon law being taken in the Pseudo-Isidorian sense.
The court of the neighbouring canonica is by Bramante, and so also may be the design of the cloisters of the monastery of S.
Dictionaries: Durand de Maillane, Dictionnaire canonique (Paris, 1786), re-edited by Andre under the title, Cours alphabeti ue et me'thodique de droit canonique, and by Wagner (Paris, 1894), has Gallican tendencies; Ferraris, Prompta bibliotheca canonica, &c., several new and enlarged editions; the best is that of Migne (1866), completed by Father Bucceroni, Ferraris Supplementum (Rome, 1899).