Tall narrow circular stone towers with conical roofs built within Irish monasteries, probably as places of refuge, from the 9th century ad onwards. A small number of examples were built in western Scotland and the Isle of Man. Typically such towers had several storeys, each lit by a small window. The doors were set high off the ground, making them eminently defensible. Some were later used as campaniles; others may have been built for this purpose.
Subjects: Archaeology — European History.