Architecture of Scotland in the Roman era Elginhaugh fort, in Midlothian, dates to about this period, as may Castle Greg in West Lothian. The Romans eventually withdrew to a line in what is now northern England, building the fortification known as Hadrian's Wall from coast to coast. Around 141 CE the Romans undertook a reoccupation of southern Scotland, moving up to construct a new "limes" between the Firth of Forth and the Firth of Clyde. The resulting Antonine Wall is the largest Roman construction inside Scotland. It is a sward-covered wall made of turf, around high, with nineteen forts and extending for . The stone foundations and
Scotland during the Roman Empire subjugating a population that did not conform to the strictures of local governance that Roman power usually depended on to operate through. The technology of everyday life is not well recorded, but archaeological evidence shows it to have been similar to that in Ireland and Anglo-Saxon England. Recently evidence has been found of watermills in Pictland and kilns were used for drying kernels of wheat or barley, not otherwise easy in the changeable, temperate climate. Although constructed in earlier times, brochs, roundhouses and crannogs remained in use into and beyond the Pictish period. Elsewhere in Scotland wheelhouses were constructed, probably