The answer is simple, Riddler: It is because the Celts got their asses handed to them by the Romans that they get shafted.

History remembers the victors...mostly because victors write the history. So, the losers are termed "violent barbarians" to justify their actions, make it a "just war". And who wants to study the losers of a war? People usually concern themselves with the winners (emulation?). And that, Riddler is the answer to your little Riddle.

Besides, doing one's own research gives one such a wealth of information that school studies don't. Don't ya think?

*grin*