So Hopefully this hasn't been asked, I didn't go back too far in the questions. So bear with me, my history is lacking.

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I'm out and about harassing Romans, right. So much so we conquer every place except for the capital, Rome. Until I touch of one the senators. He of course doesn't like this much and takes a swing, which leaves me to kill them all, sack the city then demand a ransom because it's such a dirty place before me and my Gauls will leave.

Who am I?