I've been checking out Legends mode, and this handy viewer:
http://www.bay12forums.com/smf/index.php?topic=72702.0 to find historically interesting embark locations. Just found a dwarven civilization that consists of just a single settlement, population 377 (all the other dwarven civs are thousands strong). Although they are quite close to elves and goblins, they have never gone to war. This is because of Reg.
Reg Bisekerith was one of the first dwarves in the world, having been created in year 1 as the General of the settlement Roadfords of the civilization known as The Citadel of Spreading (note: it's ironic that the civ has never spread beyond its founding walls!). However, in year 2, he profaned the Cathedral of Diamond. Geshud, the local Mountain God punished Reg by cursing him and turned him into a were-armadillo. Reg left town and went into retreat for two years, before returning as a sworn enemy of Roadfords.
His first act of vengeance was eating someone's pet rabbit, but this was just an appetiser. Over the following 250 years Reg has come to disrupt the fortress again and again and again. He is now known as "The Beak of Heather" and has 24 kills to his name. Not only that, but he has successfully bitten and cursed 8 of his former kin, who now also regularly run rampant through the halls, killing and maiming as they go. Roadfords has suffered nearly 600 were-beast rampages in the last 250 years, claiming the lives of 142 dwarves.
There have been 14 kings and queens of the Citadel of Spreading. About half of them were killed by the were-beast plague. The current ruler is Mistem Inethartob. After battling with were-beasts all his life (most recently, Reg the Beak of Heather), he has decided that he cannot face the same fate as his forebears. He has become obsessed with his own mortality and seeks to extend his life by any means.
This means one of two things. He will get bitten by Reg and become an immortal were-beast. Or he will access arcane knowledge and become a Necromancer. I am tempted to run the simulation again, but give it another couple of decades, to see if Mistem manages to achieve his goal...