Favorite Small Medieval Kingdom

[niikeb]

What is your favorite underdog in Medieval history?

The Plucky little fellow that was unique in some way?

Were they the Knights of Malta? A tiny little island figting a naval war against The Ottomans?

Amorica, the Briton refuge in France that never gave up?

Venice? The last never conquered portion of Roman Italy (until Napoleon)?

Switzerland, those plucky Mountaineers who took on the HRE?

Or even some of the less successful ones?
Cornwalls the northern version of Amorica?
The Armenian Kingdom of Cilicia?

There are a ton of kingdoms (And Even a few Democracies) that existed in the Medieval era.

Who is your favorite and Why?