The Asterix series has been criticized for not exactly keeping historical accuracy at its forefront. On the other hand, it does replicate Hollywood historical accuracy fairly well, and throws in endless puns that might seem obscure to a 21st century audience, but were timely for the time period in which Goscinny and Uderzo were working (for example, on this page is the latin 'quo vadis' which also is the title of a big-budget movie from that approximate era). In a different volume titled Asterix and Cleopatra, the attachment of the series to a Hollywood understanding of history was even closer, with direct allusions to the 1963 Elizabeth Taylor movie which was then (and may still be) the most expensive Hollywood film ever made. How many puns are the work of English translators of the French original, I do not know.
In the series, the interactions between Obelix and Asterix with the Romans always ended in Roman frustration.