Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
The provinces, which Caesar found in existence, were fourteen in number:
seven European--the Further and the Hither Spain, Transalpine Gaul,
Italian Gaul with Illyricum, Macedonia with Greece, Sicily,
Sardinia with Corsica; five Asiatic--Asia, Bithynia and Pontus,
Cilicia with Cyprus, Syria, Crete; and two African--Cyrene and Africa.
To these Caesar added three new ones by the erection of the two new
governorships of Lugdunese Gaul and Belgica(79) and by constituting
Illyricum a province by itself.(80)
80. As according to Caesar's ordinance annually sixteen
propraetors and two proconsuls divided the governorships among
them, and the latter remained two years in office (p. 344), we
might conclude that he intended to bring the number of provinces in
all up to twenty. Certainty is, however, the less attainable as to
this, seeing that Caesar perhaps designedly instituted fewer
offices than candidatures.
