Charlemagne, Emperor of The Holy Roman Empire (King of The Franks) - dies today. Sometimes referred to as "Charles The Great", he united most of Western Europe during his reign.
There were 2 distinct images that could convey the water source. The first was a Roundel (or circle), with 5 wavy lines of alternate color. The second, was an actual image of the fountain. They mostly conveyed religious or pious meanings.