The Antonine wall was designed to replace Hadrian's wall as a farther frontier between Roman Britannia and the northern barbarian region.
Citation:
Bouchard, Elsa. "Construction of the Antonine Wall".
The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11469, accessed 23 May 2013.]