II.--CELTIC ART AT CLONMACNOISE 550 The Ollamh-builder 551 Gobban Saer 551 _Religh-na-Cailleach_ 552 Crosses and Architectural Ornaments in Sculpture at Tuam and Cong 554 Turlough rebuilds the Cathedral of Tuam 557 The Abbey of Cong 558 The Cross of Cong 560 The Chalice of Ardagh 562 The Shrine of St. Manchan 564 CHAPTER XXIII. IRISH SCHOLARS ABROAD I.--ST. VIRGILIUS, ARCHBISHOP OF SALZBURG 566 Country of St. Virgilius 566 Accusations against Virgilius 569 Doctrine of the Antipodes 570 Virgilius, the Apostle of Carinthia 572 Discovery of the Tomb of Virgilius 573 II.--SEDULIUS, COMMENTATOR ON SCRIPTURE 574 Writings of Sedulius 574 III.--JOHN SCOTUS ERIGENA 576 Born in Ireland 576 Patronised by Charles the Bald 579 His _Liber de Prædestinatione_ 581 Alleged Errors about the Real Presence 583 His Translation of the Pseudo-Dionysius 584 His Treatise _De Divisione Naturae_ 586 This Book condemned A.D. 1225 587 His Death 588 IV.--FOREIGN SCHOLARS IN IRELAND 589 College of Slane 590 Dagobert, a Pupil of Slane 590 Egbert in Ireland 591 Studies in Connaught 592 St. Chad in Connaught 593 St. Willibrord in Ireland 594 Agilbert, Bishop of Paris, in Ireland 595 CHAPTER XXIV. GAEDHLIC SCHOOLS AND SCHOLARS OF ANCIENT ERIN.