Guilelmus Peraldus, approximately 1109-1271, “Summa de virtutibus et vitiis [folium 100],” Digital Collections, accessed December 12, 2025, https://digitalcollections.library.gvsu.edu/document/40117.
One leaf from Summa de virtutibus et vitiis by Guilielmus Paraldus. Printed in Cologne by Heinrich Quentell in 1479. Illustrated with red rubricated initials. [GW 12050; ISTC ip00084000]