San Crisogono
Gregory of St. Grisogono (Gregory, cardinal presbyter of San Crisogono, Gregorius de sancto Grisogono, Gregorio di San Crisogono) (died November 30, 1113 at Lucca) was a cardinal and author on canon law. He is known for his work Polycarpus, i.e.. "Canonum collectio "Polycarpus"".