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(Lat. ala; Old Fr. aile), sometimes written Isle, Yle, and Alley; in architecture one of the lateral or longitudinal divisions of a church, separated from the nave (sometimes called the centre aisle) by rows of piers, pillars, or columns. Sometimes a church has one side-aisle only. Often the aisle is continued around the apse. Occasionally the aisles stop at the transepts. In very large churches transepts may have three aisles. As a rule in Gothic architecture the aisle-roofs are much lower than the nave roof, allowing the admission of light through the clerestory windows, but in most of the Romanesque churches the aisle-roofs are but little lower than that of the nave. The aisle is generally one story, but occasionally there is an upper story, sometimes used as a gallery. As a general rule, churches are divided into three aisles, but there is no fixed rule that governs the number. The cathedrals at Chichester, Milan, and Amiens have five aisles; Antwerp and Paris seven. The most remarkable in this respect, the cathedral of Cordova in Spain, has nineteen. Aisles existed in the Roman basilicas, and in the majority of Christian churches of all periods. Transepts were sometimes called the cross isle or yle. The term is popularly used to describe the passage between pews or seating.
THOMAS H. POOLE
(Also Aistulf, Astulph, Astulf, and Astolph).
King of the Lombards; died 756. He succeeded his brother Ratchis in 749, and set about the conquest of all Italy. After taking from the Greeks the Exarchate of Ravenna he was about to seize the Patrimony of St. Peter when Pope Stephen II (or III -- 752-57) appealed for aid to Pepin the Short, King of the Franks. Failing to influence the Lombard king by persuasion, Pepin led an army through the passes of the Alps, defeated Aistulph, and besieged him in the city of Pavia (754). A peace was then concluded, Aistulph undertaking to surrender the Exarchate and all other territory conquered by him. But Pepin and his Franks had hardly returned to their own country when Aistulph besieged Rome itself, and laid waste the surrounding territory. A second time responding to the Pontiff's call, Pepin again besieged Pavia and again overpowered Aistulph. This time Pepin took care to exact substantial guarantees for the fulfilment of Aistulph's promises; the latter was obliged to pay an indemnity and surrender to his conqueror the town of Comacchio, on the Adriatic, which had not formed part of the Exarchate. Constantine Copronymus, the Byzantine Emperor, asserted that the Exarchate of Ravenna was his by right, and had been violently wrested from him by Aistulph. He demanded its restitution by Pepin. The latter replied that the Exarchate and all other territory rescued from the hands of Aistulph belonged to the victor by right of conquest; he then endowed the Holy See with these territories, his representative, Fulrad, Abbot of St. Denis, formally laying the keys of the fortified places with a deed of gift upon the altar of St. Peter. Aistulph even yet found pretexts to postpone the actual evacuation of some of the theoretically surrendered places, and it is probable that he contemplated another essay of the chances of war. A fall from his horse while hunting (or according to some, a wound received from a wild boar) ended his life before he had time to renew his warlike enterprises. He left no male issue. (See TEMPORAL POWER.)
BARONIUS, Ann. Eccl. ad an. 750, 3-756, 2; Liber Pontif. (ed. DUCHESNE) I; DUCHESNE, Les premiers temps de l'état pontifical (Paris, 1896); HODGKIN, Italy and her Invaders (Oxford, 1896), VI; MANN, The Lives of the Popes in the Early Middle Ages (London, 1902).