Hours of the Virgin of Chartres, Saint-Père-en-Vallée O.S.B. [1301 to 1500] [1301 to 1500] - Matins - Lesson I - O beata Maria, quis tibi digne ualeat iura gratiarum et laudum preconia impendere, que singulari tuo | HORAE | Fulberti Carnotensis episcopi, Sermo IX (PL 141, 338 c d) | Lesson | h800