« A.U.C. 699 = 55 B.C. »

Brind'Amour inferred that this year was a 377-day intercalary year from indirect data; see discussion under A.U.C. 701 = 53. Its intercalary nature has since been confirmed directly by a tessera nummularia (AE (1992) #177; P. Pensabene in Studi per Laura Breglia II (1987) 69-76 [non. vid.]) dated Kal. Int. Cn. Po. M. Li. II, i.e. on Kal. Int. in the second consulate of Gnaeus Pompeius & M. Licinius Crassus = A.U.C. 699.

Against this, G. Radke, Fasti Romani 58, noted Cicero, De Provinciis Consularibus 37, which appears to indicate that Ianuarius, Februarius and Martius would be sequential, and argues that it indicates that this year was regular. However, since Cicero's speech was delivered in the middle of the previous year, his statement must be considered as indicating that the decision to intercalate had not yet been made.

This year was 377 days long, apparently the first in nearly a century. I see two possible explanations for this, both based on the fact that the previous three intercalations had been separated from their predecessors by three years rather than two.

That is, this year was 377-days long in order to break the pattern that had arisen over the previous decade. However, in the event neither of the next two years were intercalary, with the result that a market day fell, after all, on Kal. Ian. A.U.C. 702 = 52.

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