"To the Emperor Caesar Titus Aelius Hadrianus Antoninus
Augustus Pius, the father of his Country, a vexillation of the
20th Legion, the valiant and victorious, constructed 3000 paces
of the wall." Note the boar, symbol of the "Valliant XXth."
It looks more like a pig in a barbeque pit to me. The man huched over is mopping it with sauce. It must be about ready, because the woman seems to be signalling that it is time to bring out the side dishes.
A mock up of the Alesia fortifications of Julius Caesar.
Weren't those called "limes"?