Appian's Civil Wars forms the only surviving continuous narrative of the Roman Republic's last century. This is the period typically attributed to the fall of the Republic, and indeed Appian begins his history with the Gracchi, the violence around their tribunates marking, in his view, the origins of constitutional breakdown. That Appian begins with Tiberius Gracchus shows sophistication in discerning underlying historical causes, and an understanding of politics well beyond the narrow realm of great men. The problem is that the period of republican decline is only covered in summary fashion, and most of Appian's work describes what happened after Caesar crossed the Rubicon. Thus the 133-49BC narrative takes all of ninety pages, leaving much unanswered. Indeed, Sallust is probably a more interesting source on the late Republic, if only because he was actually a contemporary (Appian wrote two centuries after the fact; it is most likely the lack of sources that constrained his narrative).
Appian's history, however, is beautifully written (like Sallust's), and is extant on the civil wars up to 35BC. The account of the Ides of March will be of particular interest to many readers. Only one warning to the unwary: the speeches are a standard feature of classical history-writing, but it is generally assumed they are apocryphal. Appian's work also contains inevitable inaccuracies: he has the mob burn down the curia at Caesar's funeral, for example, in revenge upon the site of his murder, but as is implied in earlier chapters, Caesar had been killed in the temple of Venus belonging to Pompey's theatre, where the senate had met that day. This is, nevertheless, a must for anyone interested in the transition from Roman Republic to empire.