1 For a list of liturgical sources of Sens, see Henri Villetard, Office de Saint Savinien et de Saint Potentien, Bibliotheque musicologique, Vol. V (Paris, 1956), pp. 91-114. Villetard did not know of the Walters Breviary, but there seems little reason to doubt that it originated in Sens, as is said by Seymour de Ricci in Census of Medieval and Renaissance Manuscripts in the United States and Canada (New York, 1935), 1, 777, No. I30. The Walters Breviary is small in size and beautifully executed; it contains only the feasts of the Temporale, except for a few saints' days after Christmas. I am profoundly indebted to Miss Dorothy Miner of the Walters Art Gallery for graciously permitting me to examine this manuscript on several occasions, and to Albert and Mary Ellen Meyer, who first called my attention to it. The dates given here for the two other manuscripts are taken from Jacques Chailley, Un Document nouveau sur la danse ecclesiastique, Acta musicologica, XXI (1949), 20, 22; Villetard says they are both of the I3th century. Lat. 1028 is described by Victor Leroquais in Les briviaires manuscrits des bibliotheques publiques de France (Paris, 1934), III, 3-5. Leroquais's catalogue has been relied on for dates and places of origin of other breviaries referred to in this study.
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