Had Quintus Servilius Caepio not managed to bribe the three ambassadors he found to kill celtiberian leader Viriatus back in 140 BCE, we'd probably see the celtiberian lusitanian resistance against roman rule not dwindling.
Fast forward a few decades, and an united (or at least semi-united) Celtiberia may become a competent military power and one good enough to face off against the romans.