On Ponte dei Pugni (Bridge of Fists), which was the most famous venue for these spectacles, there are marble feet markings which were the starting positions for fighters.
SPI does not exist anymore, but there are other publishers still doing it, although the market is much smaller now. The biggest one is probably GMT games.
ISBN prefixes does not always indicate a country. They may be are indeed countries, but others are language areas (e.g. 0/1=English) or "regions" (groups of countries) or even other subjects.
High level programming languages were conceived by humans and for humans. Will AIs in future better use their own languages, or maybe even output machine language directly?