Limes Britannicus
The frontier of the Roman Empire in Britain is sometimes styled Limes Britannicus ( "British Limes" ) by authors for the boundaries , including fortifications and defensive ramparts , that were built to protect Roman Britain ( the term "Limes" is mainly and originally used for the Roman frontier in the Germanic provinces ) . 
<triplet> defensive rampart <subj> fortifications <obj> subclass of <triplet> Roman Britain <subj> Roman frontier <obj> part of <triplet> Roman frontier <subj> Roman Britain <obj> has part