mediumaevum:A collection of Black Books of HoursBlack Hours, ca. 1475 (Morgan Library, New York)Hora
mediumaevum:A collection of Black Books of HoursBlack Hours, ca. 1475 (Morgan Library, New York)Horae beatae marie secundum usum curie romane, ca. 1458 (Hispanic Society of America)Black Hours of Galeazzo Maria Sforza, ca. 1466-1476 (Austrian National Library) -- source link