ABSTRACT
The codex is a little smaller in page size than the central Notre Dame MSS and considerably smaller than Mo; it most nearly approaches the size of MüA. Thus LoC II and MüB are closely connected, and most probably the lost portion of the latter MS contained other motets in common with our collection. The organum setting is a late transmission in F,111 and the chant comes into the motet repertory only at this middle period,112ca.1225–1235. This motet is important because it gives definite MS evidence of an historical sequence of forms that appear also to be the necessary stages preceding the two unica in LoC II. H. Husmann, "Notre-Dame-Epoche," MGG, vol. IX (1961), col. 1712, has divided the Notre Dame era into three periods: the period of Leonin, the period of Perotin, and the Late Style, together lasting from 1180 to 1250. For motets it would be more accurate to divide thus: ca. 1190–1215, ca. 1215–1230, and ca. 1230–1250.
