rities, but his general sources of information were--in history and
chronology, Castor, Ephorus and Apollodorus; in geography, Agatharchides
and Artemidorus. In special sections he followed special
authorities--e.g. in the history of his native Sicily, Philistus and
Timaeus.

_Editio princeps_, by H. Stephanus (1559); of other editions the best
are: P. Wesseling (1746), not yet superseded; L. Dindorf (1828-1831);
(text) L. Dindorf (1866-1868, revised by F. Vogel, 1888-1893 and C. T.
Fischer, 1905-1906). The standard works on the sources of Diodorus are
C. G. Heyne, _De fontibus et auctoribus historiarum Diodori_, printed
in Dindorf's edition, and C. A. Volquardsen, _Die Quellen der
griechischen und sicilischen Geschichten bei Diodor_ (1868); A. von
Mess, _Rheinisches Museum_ (1906); see also L. O. Brocker,
_Untersuchungen uber Diodor_ (1879), short, but containing much
information; O. Maass, _Kleitarch und Diodor_ (1894- ); G. J.
Schneider, _De Diodori fontibus_, i.-iv. (1880); C. Wachsmuth,
_Einleitung in das Studium der alten Geschichte_ (1895); GREECE;
_Ancient History_, "Authorities."

DIODOTUS, Seleucid satrap of Bactria, who rebelled against Antiochus II.
(about 255) and became the founder of the Graeco-Bactrian kingdom
(Trogus, _Prol._ 41; Justin xli. 4, 5, where he is wrongly called
Theodotus; Strabo xi. 515). His power seems to have extended over the
neighbouring provinces. Arsaces, the chieftain of the nomadic (Dahan)
tribe of the Parni, fled before him into Parthia and here became the
founder of the Parthian kingdom (Strabo l.c.). When Seleucus II. in 239
attempted to subjugate the rebels in the east he seems to have united
with him against the Parthians (Justin xli. 4, 9). Soon afterwards he
died and was succeeded by his son Diodotus II., who concluded a peace
with the Parthians (Justin l.c.). Diodotus II. was killed by another
usurper, Euthydemus (Polyb. xi. 34, 2). Of Diodotus I. we possess gold
and silver coins, which imitate the coins of Antiochus II.; on these he
sometimes calls himself Soter, "the saviour." As the power of the
Seleucids was weak and continually attacked by Ptolemy II., the eastern
provinces and their Greek cities were exposed to the invasion of the
nomadic barbarians and threatened with destruction (Polyb. xi. 34, 5);
thus the erection of an independent kingdom may have been a necessity
and indeed an advantage to the Greeks, and this epithet well deserv