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].