グリエルモ2世
Richard of San Germano (; before 1170 – after October 1243) was a notary in San Germano in the Latin Valley not far from the monastery of Monte Cassino between February 1186 and March 1232. He wrote a chronicle (sometimes "Chronica regni Siciliae") of the Mezzogiorno from the death of William II of Sicily in 1189 to 1243. It is the fullest source of information on the Hohenstaufen in Italy.