See E. Manson, _Builders of our Law_ (1904).
CHIUSI (anc. _Clusium_), a town of Tuscany, Italy, in the province of Siena, 55 m. S.E. by rail from the town of Siena, and 26 m. N.N.W. of Orvieto. Pop. (1901) 6011. It is situated on a hill 1305 ft. above sea-level, and is surrounded by medieval walls, in which, in places, fragments of the Etruscan wall are incorporated. The cathedral of S. Mustiola is a basilica with a nave and two aisles, with eighteen columns of different kinds of marble, from ancient buildings. It has been restored and decorated with frescoes in modern times. The campanile belongs to the 13th century. The place was devastated by malaria in the middle ages, and did not recover until the Chiana valley was drained in the 18th century. For the catacombs see CLUSIUM.
CHIVALRY (O. Fr. _chevalerie_, from Late Lat. _caballerius_), the knightly class of feudal times, possessing its own code of rules, moral and social (see KNIGHTHOOD AND CHIVALRY). The primary sense in the middle ages is "knights" or "fully armed and mounted fighting men." Thence the term came to mean that gallantry in battle and high sense of honour in general expected of knights. Thus "to do chivalry" was a medieval phrase for "to act the knight." Lastly, the word came to be used in its present very general sense of "courtesy." In English law chivalry meant the tenure of land by knights' service. It was a service due to the crown, usually forty days' military attendance annually. The _Court of Chivalry_ was a court instituted by Edward III., of which the lord high constable and earl marshal of England were joint judges. When both sat the court had summary criminal jurisdiction as regards all offences committed by knights, and generally as to military matters. When the earl marshal alone presided, it was a court of honour deciding as to precedence, coats of arms, &c. This court sat for the last time in 1737. The heraldic side of its duties are now vested in the earl marshal as head of the Heralds' College.
CHIVASSO, a town and episcopal see of Piedmont, Italy, in the province of Turin, 18 m. N.E. by rail from the town of Turin, 600 ft. above sea-level. Pop. (1901) 4169 (town), 9804 (commune). It is situated on the left bank of the Po, near the influx of the Orco. The cathedral is of the 15th century with a fine façade ornamented with statues in terra-cotta. It was an important fortress in the middle ages, and until 1804, when the French dismantled it. One tower only of the old castle of the marquesses of Monferrato, who possessed the town from 1164 to 1435, remains. Chivasso is on the main line from Turin to Milan, and is the junction of branches for Aosta and Casale Monferrato.