bivalate, bivallate

In military architecture, a pair of defensive ditches and earth embankments, usually concentric, that surround a mound or medieval fort.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Les Davies MBE will lead this excursion to the ancient bivallate Iron Age fort of Dolebury in the heart of the Mendip Hills, which offers views stretching to Wales and Exmoor.