Renovations & extensions

1218: Establishment of the suffragan diocese of Seckau by Archbishop Eberhard II, church becomes cathedral church, vestibule added
1259: Devastating fire devastates the monastery and Romanesque wooden ceiling; Gothic cloister is created afterwards
1332: Letter of indulgence from Pope John XXII. for believers in the Seckau diocese when venerating the miraculous image
1590: Burial of Archduke Charles II in the mausoleum of the basilica
1625–1628: Completion of the Renaissance building of the monastery complex with a three-story 100m arcade
1782: The monastery was abolished by Emperor Joseph II after 640 years; Decay, deportation of books and art treasures
1883: Repopulation by Beuron Benedictine monks on September 8th
1886: Collapse of the north tower, destruction of part of the north wing
1893: Completion of new church towers in neo-Romanesque style; Extension by 2 bays to the east
1952–1960: Boeckl frescoes in the Angel Chapel
1964: Redesign of the chancel by Clemens Holzmeister
2017/18: Interior restoration on the occasion of the 800th anniversary of the diocese; new stone floor, lighting technology