Wow, that is actually pretty surprising.

This is quite interesting, less so that its 'obscure British king #43" and more that it was one that signed the Magna Carta. Although, tracing your ancestral roots that far back doesn't surprise me that you can find that your distantly related to a fairly famous person at some point. Genghis Khan comes to mind (Although he got it on with just about everything that was/looked feminine.)
Interesting find. Good thing it wasn't someone like King George the III'd or something. That would be awkward.