You can’t discuss kings without discussing the rich history of Europe with thousands of years of oral and written history long predating the Sumerians and even the ancient Proto Indo-European peoples to which European language and culture is often erroneously attributed.
The dark ages were anything but dark.
Ancient Europe was anything but primitive.
And yet it’s so rarely discussed in the mainstream.
Can you give us a few pointers or links?
The "dark ages" were also thousands of years after the Sumerians. Even the Greek Dark Age postdates Sumer by a millennium.
So you're not really filling me with confidence about your idea here. Perhaps you can provide some sort of evidence?