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Lo and behold, the great dual monarchy of Galicia-Leon:
bO6J8.jpg
 
Whoa now somebody better nab that title before it disappears into the void! (Also I found out you can still play if you have only one barony holding, so long as you hold another title that is higher than count)

I considered doing that, but instead I decided to marry so that I inherit land instead of just titles (I've got plenty of titles already). Funny thing is, about 200 years later Galicia-Leon is still there, and it still only owns the barony of Cistierna.
 
I'm not sure if this beats Geoffrey Ironside (posted a few pages back) or just equals him, but it's definitely one of my two longest reigns so far:

8vjGb.jpg


Just died at 85 -- reign was 1060 - 1137.