Emperor Frederick III ordered the rebuilding as his court church, built from 1438 to 1462 in the lead and infobox, and finished by about 1464 in the history section. The builder is thought to have been the Swabian architect Hans Niesenberge. It is a Gothic hall church with a broad nave and two narrower aisles divided by eight octagonal piers, built of brick and limestone.
The Jesuits received it in 1577. Baroque additions include four side chapels from 1617 to 1667 and a high altar from 1730 to 1733, with a veined marble finish. A restoration from 2017 to 2023 cost 6.5 million euros and added a basalt altar and rebuilt organ.
It is the bishop's church of the Diocese of Graz-Seckau. It is open daily with free admission except during services.

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