Gregory IX (c. 1147-1241) Medieval pope. Author of a compilation of decretals (i.e., authoritative decisions) on canon law; during a critical period he was instrumental in maintaining the remnants of Roman law.
The 23 marble relief portraits over the gallery doors of the House Chamber in the U.S. Capitol depict historical figures noted for their work in establishing the principles that underlie American law. They were installed when the chamber was remodeled in 1949-1950.