Basilica of Saint Castor, Koblenz

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Basilica of Saint Castor, Koblenz

Basilica of Saint Castor, Koblenz (must see)

Rising near the confluence of the Rhine and Moselle rivers, the Basilica of Saint Castor is the oldest preserved church in Koblenz and a landmark deeply woven into the city’s history. Founded in the early 9th century under the rule of Emperor Louis the Pious, the basilica was dedicated to Saint Castor, a 4th-century priest venerated for his missionary work in the region. Over the centuries, the church has witnessed imperial councils, political negotiations, and religious ceremonies, making it a silent witness to pivotal moments in European history.

Architecturally, the basilica is a striking example of Romanesque design, later enriched with Gothic and Baroque elements. Its twin western towers, symmetrical and commanding, are a defining feature of the Koblenz skyline. Inside, visitors find a serene blend of soaring arches, rounded windows, and a nave lined with columns that lead the eye toward the high altar. The interior also preserves medieval frescoes and intricately carved details that hint at the craftsmanship and devotion of the artisans who shaped the building.

Beyond its architectural beauty, the basilica holds deep historical resonance. In 842, the Treaty of Verdun was negotiated here, a defining event that divided the Carolingian Empire and laid the groundwork for the modern states of France and Germany. Over the years, the church has endured periods of war, destruction, and restoration, yet it has remained a place of worship and a cultural touchstone for the people of Koblenz.

Today, the Basilica of Saint Castor offers travelers both a place of reflection and a window into the city’s layered past. Admiring its historic crypt, lingering in the quiet of its cloisters, or looking out toward the Deutsches Eck where two great rivers converge, visitors encounter a basilica that weaves spiritual heritage with the broader story of European history.

Want to visit this sight? Check out these Self-Guided Walking Tours in Koblenz. Alternatively, you can download the mobile app "911: Walks in 1K+ Cities" from Apple App Store or Google Play Store. The app turns your mobile device to a personal tour guide and it works offline, so no data plan is needed when traveling abroad.

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Basilica of Saint Castor on Map

Sight Name: Basilica of Saint Castor
Sight Location: Koblenz, Germany (See walking tours in Koblenz)
Sight Type: Religious
Guide(s) Containing This Sight:

Walking Tours in Koblenz, Germany

Create Your Own Walk in Koblenz

Create Your Own Walk in Koblenz

Creating your own self-guided walk in Koblenz is easy and fun. Choose the city attractions that you want to see and a walk route map will be created just for you. You can even set your hotel as the start point of the walk.
Koblenz Introduction Walking Tour

Koblenz Introduction Walking Tour

Local legends say that one 16th century robber stuck out his tongue before being executed. Instead of finding this event grim, Koblenz residents made the cheeky robber a symbol, nowadays immortalized in the shape of a little boy's statue.

The city's name comes from the Latin ad confluentes, meaning “at the confluence”, referring to the meeting point of the great rivers Moselle...  view more

Tour Duration: 3 Hour(s)
Travel Distance: 4.2 Km or 2.6 Miles