Livi quoting Caesar. Hence the use of "Inquit" which ha sno direct translation but implies a quote. The speaker is a substitive. Since the speaker's gender is undefined it is assumed to be Male . The translation is, "'The die is cast,' he said"

Caesar misquoted "The die has been cast." Caesar's version doesn't use the passive voice correctly and was therefore hard to translate. We know this is his exact quotation because it was written in a letter.

Good knowledge on your part. Have you done any academic studies on it or just outside research?