Johannes de Deo (died 1267)

Johannes de Deo[1] (c. 1190 – 15 March 1267) was a Portuguese priest, judge and scholar of canon law who taught for over twenty years at the University of Bologna.

[3] He refers to himself as a priest, and seems to have been ordained in Lisbon before studying at the University of Bologna.

[5] By March 1260, he had left Bologna to become archdeacon of Santarém in the diocese of Lisbon.

One of his cases involved the monastery of Santa Cruz in Coimbra and the philosopher Pedro Julião, the future Pope John XXI.

[3] Johannes Andreae had a low opinion of the Arbor versificata, which he said was so difficult and obscure as to make known things unknown.

Rubric from the start of the Liber poenitentiarius in an Austrian manuscript of c. 1400 . The elongated initial belongs to Incipit liber ('the book begins') and the name Johanne de Deo is in the third line from the top.