Board Thread:Timeline Discussions/@comment-4923787-20130202175501/@comment-32656-20130325081246

They actually aren't pan-Celtic symbols. It was only a symbol for one out of the many Celtic cultures - and most of "Gaul" was not part of this culture. As a symbol for Gaul, it's meaningless.

The head of the Antonines - the future emperor Nerva - was actually the brother in law of Otho. the man went over to Vespasian at some point between Otho's death, and Vespasian's arrival in Italy. After being one of the advisers to Vespasian's successors, he was named emperor when Vespasian's younger son, Domitian, was assassinated.

Basically, he's going to support Otho. That being said.... not impossible for him to become emperor after Otho.