It has come to my attention recently that there is a controversy about the existance of the so called "Kingdom of Soissons". The information about it is very conflicting, especially about the size of it's territory, the wikipedia page for instance, contradicts itself several times, and has lots of unsourced statements. So what's the deal with the kingdom of Soissons ? Did it really exist ? What territory it controlled, if any ? What are the main sources for it ? And what are some debates regarding it among historians ?