The word "pizza"
The word "pizza" first appeared in Italy in 1132 A.D.
It should have arrived at 1131 so they got it for free.
On the subject of the Italian double Z (ZZ) instance, is it always pronounced like a T? I was told as much but I have never heard jacuzzi pronounced as such. .
Italian 'z' is not pronounced like the English 'z'.
It's pronounced as /ts/. As in pizza (pits-sa). You'll only hear it pronounced as English 'z' when they're pronouncing foreign (non-italian) words.
Italian 's', on the other hand, can make either an English 's' sound or an English 'z' sound.
This is how the word Jacuzzi is pronounced in Italian http://forvo.com/word/jacuzzi/#it
If you find that pronunciation surprising you should read about the history of the letter 'j'.
In Italian the letter Z is always pronounced Z. The difference between one (Z) and double (ZZ) is only the sound. One (Z) has softer sound than double (ZZ). Ex. Zio, Azione, Mozione, have soft sound. Azzurro, Ragazzo, Ragazza, have hard sound. (no T sound).