ophrey (ecclesiastical vestment), 950
optics, 864
Opus nonaginta dierum (William of Ockham), 681
Opus Oxoniense (John Duns Scotus), 309
Opus Parisiense (John Duns Scotus), 309
Opus quadripartitum numerorum (Jehan des Murs), 494, 645
Opuscula sacra (Boethius), 133, 393
Orange, Second Council of, 161
Orationes sive meditationes (Anselm of Bec), 45
Orbais, 409, 683, 890
Orcival, 683
ordeals, in criminal justice, 61, 273
Ordene de chevalerie, 266
Order of Preachers. See Dominican order
Order of the Ermine, 486, 535
Order of the Golden Fleece, 212, 307, 398–99, 456, 513, 535, 538, 731, 946
Order of the Passion of Jesus Christ, 616
Order of the Sack, 301
Orderic Vitalis, 452, 683–84
Ordinals, 553
Ordinary. See Mass: Ordinary
Ordinary chants. See chant
“Ordinary Gloss.” See Glossa ordinaria
“Ordinary time,” in liturgical year, 557
Ordinatio imperii, 176, 200, 562, 565
Ordines romani XV, 597
Ordo monasterii, 81, 787
Ordo representacionis Ade. See Jeu d’Adam
Ordo Romanus, 291, 599, 600
Ordonnance Cabochienne, 159, 183
ordonnance companies, 945
Ordre d’amours, 587
Ordres de Paris (Rutebeuf), 831
Oresme, Nicole, 202, 281, 577, 578, 684, 863
organ (musical instrument), 648, 651
organa, 165, 674, 684, 798
organa quadrupla, 684
Organon (Aristotle), 681
organum, 421, 497, 644, 684–85
oriflamme, 142, 293, 685, 950
Origen of Alexandria, 653
Orléans, 308, 685–86
campaign of, 513, 686
canons of, 447
cathedral of, 814
schools of, 313, 532, 538, 545, 685, 862
Orloge amoureus (Jean Froissart), 235, 375
Orosius, 451
orphans, protection of, 94
orthodoxy, defined, 447
Oswald von Wolkenstein, 247
Otinel, 507
Index 1984