St. Matthias (Monastery of St. Matthias)
Romanesque abbey church, 10th and 12th cent., with the tomb of the Apostle St. Matthias, apse and vault of the central nave about 1500, portals and corona of towers, 17th and 18th cent., roman burial crypts.

According to an inscription in St. Matthias, the first two Trier bishops, Eucharius and Valerius, were sent to Trier in A.D. 50 by none other than St. Peter himself, thereby placing Trier's bishop's see in direct apostolic succession. The two clerics actually lived in the late third century and were buried in the Roman cemetery on Trier's south side. Today the coffins rest in the crypt of the present parish/(Benedictine) abbey church dating from 1148. During the building of this Romanesque structure, the relics of St. Matthias (the apostle chosen to succeed Judas) were discovered, and the shrine remains a magnet for thousands of pilgrims even today.

Although the church, fronted by a baroque entrance from around 1700, has lost many of its original furnishings, the restored Gothic choir window displaying the crucifixion and the net vaulting, both from around 1500, convey something of the original splendor. Sought out by many visitors to St. Matthias is the chapel at the end of the left aisle, above whose altar hangs an icon-like painting of Our Lady from around 1700. The visitor will find a well-stocked devotional shop in the church yard.
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Irminenkloster (Irminen monastery )
Of the four former convents and monasteries (Mutterhaus der Borromäerinnen, a hospital today; St. Irminen, a home for senior citizens; Katharinenkloster, a technical school; St. Martin, a student dormitory), St. Irminen is the most interesting. The original convent was built into the ruins of a Roman granary in 640 so that even today there are Roman walls up to a height of 7.5 m/25 ft and a medieval wine cellar with a Roman Wall.

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