Antoninus, Wall of, ancient Roman wall extending across N Britain from the Firth of Forth to the Firth of Clyde. It was built by the Roman governor Lollius Urbicus in the reign of Emperor Antoninus Pius—probably in A.D. 140–42. Intended as a defense against the peoples to the north, it was built out of turf, with a ditch on the north and 19 forts along its southern side. The wall was 37 mi (60 km) long. It was abandoned c.185 when the Romans retreated to Hadrian's Wall.
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