Titles MS and Item no. IMEP volume
'Operamini non cibum qui perit sed qui permanet' Pem 237 [149] 18
'Operus rectoris de wymentoun canonici' CUL Kk.6.30 [4] 19
'Oportebat ihesum transire' CCCC 336 [111] 20
'Oportebat ihesum transire per samariam' Pem 237 [150] 18
'Opposicioun of syngnes' Caius 176/97 [5] 17
'Optima medicina pro visu' Caius 328/715 [1] 17
'Opus osberun de westmestyr' Trinity R.14.44 [15] 11
'Opus vern super cuprimu' CUL Dd.4.45 [1] 19
'Opus verum' Cph OC 248 [7] 10
'Oracio de nomina iesu' CUL Ii.6.43 [16] 19
'Oracio de nomine iesu deuotissima' CUL Ii.6.43 [17] 19
'Oracio deuotissima de beatissima maria' CUL Ii.6.43 [18] 19
'Oracione thomas de alquin' CUL Ii.6.39 [6] 19
'Oratio' Fitz 40-1950 [1]-[2] 18
Orcherd of Syon Oxf Un 14 [2] 8
Orcherd of Syon Rylands Lat 395 [1] 2
'Order ... for henry ... to bear the arms of thomas of woods' Ashmole 857 [5] 9
Order of Presthood TCD 244 [10] 25
'Ordere of hote membris' Caius 176/97 [13] 17
Ordinal of Alchemy Trinity O.4.39 [1]-[2] 11
Ordinance of Pottage CUL Ll.1.18 [7] 19
Ordinances of the Guild of St Katherine, Stamford Caius 266/670 [1] 17
Ordo ad faciendum sponsalia Caius 146/196 [A 1] 17
Ordo ad faciendum sponsalia CUL Ee.4.19 [A 37] 19
Ordo ad faciendum sponsalia Fitz 33 [A 16]-[A 17] 18