In 1972, remains were archaeologically dug out of a first church, built in Carolingian style around the year 1000 on the site of current St. Martin church. Foundations of a second church built on that spot, in Romanesque style, were found as well. The present building had been constructed between 1234 and 1365 as the church of a college devoted to the cult of Martin of Tours, and since defunct. The current, conspicuous helmet crowning the bell tower had been added in 1572 in Renaissance style after a fire.
The church is surrounded by several portals of rather small dimensions, speaking relatively to the volume of the building. Some of these portals are bricked up. The largest portals display richly sculpted tympana. The coloured tile roof, reminding that of the Collégiale Saint-Thiébaut in Thann, is another striking feature of the church's exterior. The massive pillars that support the façade, an architectural rarity, give the front of the building a somewhat cumbersome aspect that contrasts with the airy look of the high apse windows. Another noteworthy detail of the building's exterior, testament to the troubled History of Jews in Alsace, is the presence of two 'Judensäue', one in the shape of a gargoyle, the other as a corner sculpture of a portal.
In the spacious interior, whose furniture had suffered bitter losses during the French Revolution, the most remarkable features are the exuberant Baroque organ case of 1755, (the mechanism and the pipes themselves, originally built by Johann Andreas Silbermann, were completely replaced in 1979), as well as the ambulatory, a unique feature in Alsatian churches. The many chapels that surround the choir display several medieval altars and statues. Of the remaining Gothic stained glass windows in the nave, the most noteworthy is a 13th century head of a beardless Christ, another rare feature.
Martin Schongauer's monumental Madonna of the Rose Bower was painted for the church in 1473 and stood there until 1972, when it was stolen. After its recovery in 1973, it was moved to the neighbouring former Dominican Church, another Gothic, but architecturally very different sanctuary.
References:Ehrenbreitstein Fortress was built as the backbone of the regional fortification system, Festung Koblenz, by Prussia between 1817 and 1832 and guarded the middle Rhine region, an area that had been invaded by French troops repeatedly before. The fortress was never attacked.
Early fortifications at the site can be dated back to about 1000 BC. At about AD 1000 Ehrenbert erected a castle. The Archbishops of Trier expanded it with a supporting castle Burg Helferstein and guarded the Holy Tunic in it from 1657 to 1794. Successive Archbishops used the castle's strategic importance to barter between contending powers; thus in 1672 at the outset of war between France and Germany the Archbishop refused requests both from the envoys of Louis XIV and from Brandenburg's Ambassador, Christoph Caspar von Blumenthal, to permit the passage of troops across the Rhine.