Olivet, Mount, see [Mount of Olives].
Old Saxons, The, [317], [320], [321], [322].
Old Sarum, [343] n.
Opus Paschale, see [Sedulius].
Orcades, The, see [Orkneys].
Ordination of bishops, [49], [50], [53], [54].
Orkneys, The, [5], [11], [142] n., [382].
Orosius, [xxii], [5] n., [25] n.
Orthography, [389].