Calendar year
Year45 BC was either acommon year starting on Thursday ,Friday orSaturday or aleap year starting on Friday orSaturday (the sources differ, seeleap year error for further information) and the first year of theJulian calendar and aleap year starting on Friday of theProleptic Julian calendar . At the time, it was known as theYear of the Consulship of Caesar without Colleague (or, less frequently,year 709Ab urbe condita ). The denomination 45 BC for this year has been used since the early medieval period, when theAnno Domini calendar era became the prevalent method in Europe for naming years.
^ LeGlay, Marcel; Voisin, Jean-Louis; Le Bohec, Yann (2001).A History of Rome (Second ed.). Malden, Massachusetts: Blackwell. p. 129.ISBN 0-631-21858-0 ^a b Toynbee, Arnold Joseph."Julius Caesar" . Encyclopaedia Britannica. RetrievedFebruary 20, 2024 . 
