Hadrian probably restructured the province after the Trajan expansion, reducing the area to nearly half the original size (at the west of what was called the Limes Arabicus) in order to better defend Arabia Petraea from raiders and enemies. The same process occurred in Caledonia, when he abandoned the Roman forts around Inchtuthil and the Gask Ridge and created Hadrian's Wall in Roman Britain (reducing the Roman-controlled area of Scotland).