Between the works of historians and Hellenistic Greek geographer time brought to us in the form of full or partial , such as Aristotle , Demosthenes of Skylaksit distinguished historical works of Polybius remarkable that gives us important clues of the accurate history of the kingdom ardiana .Unfortunately a large part of the works , which contained these data are lost. Such are eg Theopompit works , Agatharhidit stories campaigns Philip II and Alexander of Macedon against Illyrians , Pompe Trogut History , " The History of Epirus " the Proksenit , a contemporary of Pyrrhus etc. . Great value to be had these works as first hand sources for the history of the Illyrians in an era of greater prosperity to their socio-economic and political - cultural show works best as subsequent writers of Siqelisë Diodori , Kurt Rufi , Ploutarhou , Arriani , Atheneu , Justin , etc. . , who have used these most ancient authors and we have narrated excerpts , often shortened many of them disabled , by their writings . Unfortunately there are few occasions when those preserved historical works have lost exactly those books and chapters dealing with events mainly developed in the region of Illyria at this time .Among later writers , who were seriously interested in the history of the previous century and whose work we find valuable information about the Illyrians resistance against Roman occupation in the time of Augustus , is Dion Kasi , who shines though not by critical spirit remains always a good investigator .