Ben virga and R. Joseph Hacohen, the author of Emek Habacha, state that 1,000 Jewish families lived in the city at that time.
"The Itinerary of Benjamin of Tudela"
Benjamin of Tudela
30; virga, Shebet Yehudah, Hanover, 1856, pp.
"The Haskalah Movement in Russia"
Jacob S. Raisin
The resemblance of the name to the word virga is probably at the root of this story.
"The Roman Poets of the Augustan Age: Virgil"
W. Y. Sellar