Preface Terminology and conventions Acknowledgments Chapter 1: Introduction The Patriarchal complex The Hagia Sophia Project 2004-2018 Methods and practical constraints Chapter 2: The undiscovered church: Hagia Sophia before Justinian Introduction Fourth-century structures Fifth-century structures Features below the sixth-century church identified in other recent work Conclusion Chapter 3: New light on Justinian's Hagia Sophia Introduction Buttress piers, their external staircase towers and the corner staircases in the base of the dome The Vestibules The access ramps Newly recorded sixth-century decoration Marble veneer on the church exterior Structures southwest of the Justinianic church: the Patriarchal palace Structures surrounding the Large Hall The southwest vestibule of the church The Baptistery south of the church A large rectilinear structure north of the sixth-century church Marble paving around the church and evidence for surrounding courtyards Archaeology and liturgy in Justinian's church Conclusion Chapter 4: Revealing the Byzantine cathedral: Hagia Sophia after Justinian Introduction The Skeuophylakion North-east and south-east vestibules The north-east ramp Post-sixth-century modifications to the Patriarchate Identifying the Large Hall and associated structures with the later textually-attested additions to the Patriarchal palace The Baptistery The buttresses The south-west buttress The south middle buttress The north middle buttress The north-east buttress The west flying buttresses The remaining buttresses Archaeology and liturgy after the sixth century Conclusion Chapter 5: Sixth-century Hagia Sophia in its wider context Introduction Hagia Sophia in the context of surrounding structures and landscape features Building Orthodoxy in sixth-century Constantinople Bibliography.