An architectural style emerging in Western Europe primarily in the 11th century and lasting until the advent of Gothic architecture in the 12th century; based on Roman and Byzantine elements; found especially in churches and castles; usually characterized by round arches and by massive articulated walls, barrel vaults, groined vaults, ribbed vaults; semicircular arches; served as the basis for the Richardson Romanesque style and occasionally used as a synonym for it.
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