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
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Organizations in Macedonia - The Emigrants
If, however, nothing material was done from the east to obstruct Caesar in the subjugation of the west, efforts at least were made towards securing political and military consolidation there during the respite so ignominiously obtained. The great rendezvous of the opponents of Caesar was Macedonia. Thither Pompeius himself and the mass of the emigrants from Brundisium resorted; thither came the other refugees from the west: Marcus Cato from Sicily, Lucius Domitius from Massilia but more especially a number of the best officers and soldiers of the broken-up army of Spain, with its generals Afranius and Varro at their head.
In Italy emigration gradually became among the aristocrats a question not of honour merely but almost of fashion, and it obtained a fresh impulse through the unfavourable accounts which arrived regarding Caesar's position before Ilerda; not a few of the more lukewarm partisans and the political trimmers went over by degrees, and even Marcus Cicero at last persuaded himself that he did not adequately discharge his duty as a citizen by writing a dissertatio on concord. The senate of emigrants at Thessalonica, where the official Rome pitched its interim abode, numbered nearly 200 members including many venerable old men and almost all the consulars. But emigrants indeed they were.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=55