C followed by i and e is soft (as in english ch) in ecclesiatical latin and modern Italian, but my understanding is that romans actually pronounced C as hard C everywhere. I.e. Cicero called himself Kikero.
Correct, in ancient Rome C,K and Q had the same hard sound
We are talking about classic Latin, born around the IV century b.c.
But it changed a lot over the centuries influenced by the Greeks, to the point that the Byzantin Roman empire chose Medieval Greek as official language at the end of the VI century and even before, their Latin was different from the classic Roman one. I think they abandoned Latin as official language in the third century to use Koinè Greek (sorry don't know the name in English) basically a Greek dialect, the first common form of Greek, used among all Hellenistic cities which eventually became modern Greek, still in use nowadays.
Most of the Latin found in science (like in the animal taxonomy) comes from "modern" ecclesiastic Latin which incorporated traits of vulgar and neighbors languages (French, German and Italian), it simplified the alphabet but reduced the symbols available so C was mad an affricate consonant.
In practice we have dealt with modern Latin or some form of it for the past 15 centuries, longer than Rome existed.
It also says that bus is pronounced ˈbəs, but it's a contraction of French omnibus, that comes from Latin omnibus, which is pronounced ɔmnibus (both in French and Latin), like goose, but with a much shorter oo sound.
Anyway the point was is English language that stole words from other languages and changed their pronunciation, not the other way around.
It's a slippery thing, how should the word "lead" be pronounced? Did I mean lead as in leader or lead the metal? In the English language words don't always have a unique pronunciation associated with them.
[1] https://en.wikipedia.org/wiki/Cingulata