Description from the British Library: LIBER Prosarum, for the use of the Dominican nunnery of Poissy: a collection of fifty-six proses with musical notation, preceded by some responsoria and, at f. 7 b., the office "ad noviciam recipiendam." A leaf…
This exemplar was created for the use of Humbert of Romans, the Master General of the Dominican Order responsible for much of the unification of the Dominican liturgy. It was copied, along with two other surviving exempla, at the Convent of Saint…