Rhenish helm

The Rhenish helm is a type of spire typical of Romanesque church architecture of the historic Rhineland.

It is a pyramidal roof on towers of square plan.

Each side of the tower is topped with an even triangular gable from the peak of which runs a ridge to the apex of the roof.

An early if not the first example of such spires can be found on the four tall towers of the Cathedral of Speyer.

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