Burg Lantershofen, Medieval castle in Lantershofen, Germany

Burg Lantershofen is a castle in Lantershofen, Rhineland-Palatinate, built in 1708 on the site of earlier fortifications. It stands next to the church on Graf-Blankard-Strasse and now serves as the St. Lambert priest seminary. The building was renovated under director August Dörner after 1939.

A first mention dates to 1 July 1019, when Emperor Henry II gave the estate of Lantherishoffe to Michelsberg Abbey near Bamberg. A castle built on Roman wall remains was destroyed by Cologne's archbishop Friedrich III von Saarwerden in 1372; four years later a new castle arose at "am Blankart" under Gerhard von Blankart. The present building was erected in 1708, apparently under the last Blankart, and after inheritance disputes passed in 1915 to Cologne insurance director Friedrich Langen, whose heirs sold it in 1939 to the Apostolate of Priests and Religious Vocations, which renovated it as the St. Lambert study house.

The castle displays late medieval architectural features that visitors can see in its stonework and roof design. The building underwent significant changes during the 17th and 18th centuries that remain visible in its mixed style.

The site is accessible from outside and can be viewed from the public areas near the church on the village square. A walk around the perimeter gives the best view of the entire structure and its architectural details.

The foundation may contain remnants of Roman walls, pointing to one of the earliest Frankish settlements on the left bank of the Ahr river. This lower layer of the structure connects the medieval castle to an even older past of the region.