They consolidated their gains by building Antonine's Wall across the waist of Scotland between the Firth of Forth and the River Clyde in about a.d. 150.
Antonine's Wall was built in about a.d. 150 only for it to be torn down in the next century.
mnli hypothesis: Antonine's Wall was built in about a.d. 150 only for it to be torn down in the next century. premise: They consolidated their gains by building Antonine's Wall across the waist of Scotland between the Firth of Forth and the River Clyde in about a.d. 150.