I'm inprired to post this question from another topic in the Greek forum, so I'd ask you how do you think the Romans pronounced "Cicero" or "Caisar"?
Kikero (accrding to Greeks),
or Tsitsero (according to Germans)?
Kaisar (Kesar) like the Greeks wrote,
or Tsezar or Tsetsar, like the Slavs mentioned,
or Kaisar (Ka.i.zar), like the Germans heard?
Was the Roamn alphabet phonetical after all?