Note 534 — Chapter IV · THE SOURCES FOR THE PERIOD 1100–1250 A. D.
Reading edition
In addition to the Mirabilia, there was written, probably in the twelfth century, a short tract by one Master Gregory, on the marvels of Rome, much of which was copied by Ranulph Higden in his Polychronicon. This appears to have been composed independently of the Mirabilia, although it deals with the same subject. The author may have been an Englishman. See James, Magister Gregorius, 1917 (under Gregory, Master, in the Bibliography), pp. 531–554.