Ringwork - Circular earthwork of bank and ditch.
Roll - Moulding of semi-circular section.
Romanesque - The prevailing architectural style, 8-12th cent.; massive masonry, round arches, small windows, groin-and barrel-vault.
Ringwork: An earthen defensive enclosure, regardless of period, size or function.
Risban: A fortification used for the defence of a port or harbour.
Rocco: An Italian castle or fort which served primarily a military purpose. See castello.
low, circular ringwork
Ravelin
outwork with two embankments forming a salient angle ...
Rath: Low, circular ringwork. Ravelin: Outwork with two faces forming a salient angle; like in a star-shaped fort. Rear-arch: Arch on the inner side of a wall. Redoubt: Small self-contained fieldwork, a refuge for soldiers outside the main defenses.
 See also: Embrasure, Thrust, Frame, Merlons, Hall
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