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In classical Latin, c always had a k sound because they only used the letter k in loan words from Greek; which meant that their system was pretty straightforward compared to ours, where a c can sound like k, s, ch ... then later (can't say for sure how much later, in the absence of ancient tape recorders; 5th century probably) c acquired a ch sound in front of high vowels, so the bloke we call Sisero called himself Kikero and came to be called Chichero (modern Italian cicerone) though his name was always written as Cicero.

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The more I look at that, the less clear it appears. Good luck!