The Frankish Kingdom is one of the largest ones that ever existed on European soil. It started off in what is now France and gradually was expanding and became much larger, reaching its peak during the reign of Charlemagne.
The Frankish Kingdom would have had in its borders territories of numerous modern-day countries like most of France, Andorra, very little part of northern Spain, Germany, Netherlands, Belgium, Liechtenstein, Luxembourg, Switzerland, Austria, the northern half of Italy, Monaco, San Marino, Vatican, and Slovenia.
The majority of the population in this kingdom was of Germanic and Celtic origin, with numerous smaller groups included it as well.
