My personal favourite is Cassius Dio’s. Dio is an unapologetic Caesar fan. He shows his hand early in his account when he states that Cassius and Brutus destroyed the only stable government Rome had ever known and killed Caesar out of jealousy and stupidity. Even Dio struggles a bit with Caesar’s refusal to stand for senators; he is, after all, and he might have mentioned this once or twice, a Roman senator himself. So he states ‘some said that’ Caesar had been suffering from diarrhoea that day and had therefore been unable to stand and greet the senators lest he have an unfortunate accident.