AH Challenge: Spartan Society in Medieval Times

[TheLoneAmigo]

With a POD after 200 AD, have a Spartan-stlye militaristic society exist somewhere in the Mediterranean-European region by 800 AD. Points will be awarded for:

-Plausibility
-The length of the society's existance (the longer the better)
-The power and influence of the society.


If it wasn't for Sparta's unified military society, they would have probably descended into feudalism: hoplites are fairly similar to warriors in other cultures that have descended into feudalism, but Sparta remained united for centuries.