Ogam-inscribed stones, 165 Okstrow, broch of, 82 — tankard, 116 Old Parks, tumulus, 56 Orange, Triumphal Arch of, 5 Orchomenos, spiral ornament at, 54 Origin of early Christian art, 238 Ornovasso, chains, 140 Orton Scar, penannular brooch, 227 Over-Haddon, enamelled bowl, 134 Oxford, enamelled bowl, 135 Pails, Late-Celtic, 116 P and Q Celts, 18 Panels, ornament arranged in, 255 Papil, erect cross-slab, 184 Parisi, 12 Patera, enamelled, 137 Patrick’s Will, St., bell-shrine, 204 Patrick’s, St., Gospels, shrine of, 209 Penally, cross, 193 Penannular brooch, 223 Pen-Arthur, cross-slab, 181 Penbryn, spoons, 121 Penmachno, Chi-Rho Monogram, 163 Penmon, cross, 185 Pens used by Celtic scribes, 232 Pentre Poeth, Ogam stone, 165 Perdeswell, collar, 111 Perfection of details of Celtic ornament, 256 Perforated metal plates, 236 Pergamos, 5 Perth, penannular brooch, 231 Philostratus, 133 Pins, Celtic, 219 — hammer-headed, 108 — Late-Celtic, 107 Pitalpin, armlet, 113 Pitkelloney, armlet, 113 — enamelled armlets, 134 Plait, cruciform breaks in, 262 — horizontal and vertical breaks in, 259 Plaques with Crucifixion, 218 Plato, 2 Plaitwork, 259 Plunton castle, armlet, 113 Polden Hill, enamelled harness-ring, 134 — — fibula, 106 — — horse-trappings, 95 Pol de Léon, St., bell, 201 Polybius, 3 Poole’s cave, 76, 81 Port-Blanc, dolmen, 39 Portland, Isle of, collar, 111 Pottery, Late Celtic, 121, 142 — painted, Mont Beuvray, 141 — sepulchral, in bronze age, 24 Prassede, San, Rome, 258 Presles, enamels from, 138 Prickwillow, saucepan, 117 Processes, technical, in Celtic Christian art, 232 — — iron age, 129 Psalter of St. John’s College, Cambridge, 178 — Vesp. A. i., 178 — Vit. F. xi., 178 Psalters, 176 Pyrmont, enamelled vessel, 138 Pytheas, 3 Rathconrath, wooden bowl, 127 Ravenna, screen, 245 Reask, inscribed stone, 166 Rectilinear patterns in Late-Celtic art, 159 Redlands, sculptured cist, 55 Relic shrines, 210 Repoussé metalwork, Iron Age, 132 Rhayader, gold armlet, 170 Ribchester, 82 — fibula, 107 Ricemarchus, Psalter of, 176 Ringham Low, fibula, 106 Rings for harness, 96 Rise, horse-trappings, 94 Risingham, 82 — enamelled fibula, 134 — fibula, 107 Riveting, Iron Age, 132 Rock-sculpture in Scandinavia, 60 Rodenbach, 13 Rogart, penannular brooch, 228 Rome taken by the Gauls, 4 Rosemarkie, erect cross-slab, 184, 283 Rossie Priory, erect cross-slab, 184 Rotherley, 82 Round towers, 196