Ciao is an interesting one.
Kind of like you might say 'your humble servant' in English, the Venetians would say "sciavo vostro". Literally "your slave" - schiavo vostro in modern Italian. Which then morphed into "ciao".
Kind of like you might say 'your humble servant' in English, the Venetians would say "sciavo vostro". Literally "your slave" - schiavo vostro in modern Italian. Which then morphed into "ciao".