Soissons: The post-Roman Kingdom which (probably) never existed | Rise of the Merovingians

Following the end of the western Roman Empire, numerous states arose which claimed either the Roman legacy, or were actually rump states left over following Roman withdrawal from or collapse in an area. By far the most famous is likely the kingdom of soissons. But the information we have on it is extremely limited. So with that min mind what can we say about the kingdom of soissons and the men affiliated with it: Aegidius, Syagrius, Childeric, and Clovis?