Most of these coins are Roman, and most of those Roman coins are "Late Roman bronzes", dating from within 50 years after the coinage reform of Diocletian in AD 298. Late Roman bronzes are probably the most common "ancient coin" you're likely to encounter, especially in Europe. The Romans churned out ridiculous amounts of these coins in an effort to prop up their failing economy.
The only two that are not "Late Roman" is the one in middle row far right, looks like a dupondius of Marcus Aurelius, sometime around AD 140. And the Celtic one, bottom row, second from right, with the stylized horse on it. I don't know my Celtic coins well enough to ID them by sight, but if BobL says it's Boudicca of the Iceni, you can believe it, and it's certainly a valuable coin, due to Boudicca's prominence in British history as "the most successful Anglo-Celtic rebellion against Roman rule".
They all look genuine to me; at least, nothing there shouts "I'm a fake!". They also look better-than-average condition; they are, as BobL said, all identifiable as to emperor, type and mintmark.
Most of the Late Romans appear to be from the Siscia mint. Siscia is in modern-day Croatia, and coins from Siscia tend to be very common these days, ever since the fall of Communism and the resultant Yugoslav Wars.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis