In Rewriting History, a giant statue of Ronacus was about to be put on display.
He is probably an ancestor of Ron Stoppable's, seeing as how he looked like Ron, just like Jon Stoppable.
He is a gladiator, who fought against Drakken's roman ancestor, or at least look-alike. He also fought alongside a female, who was probably Kim's ancestor, or at least look-alike.
Drakken and Kim's ancestors had only small pictures, which have been chiseled, although Ronacus was the only one with a giant statue.
He was given sole credit, although many people believe that it is the female, who played an important role in all of his victories.