Brief overview: http://www.diplom.org/Zine/S1997M/Pitre/Royale.html
In-depth rules: http://www.variantbank.org/results/rules/r/royale.htm
This was a variant by John Pitre based on the game Blood Royale. A variation for that game that could easily be applied to the Diplomacy variant: http://boardgamegeek.com/file/download/ ... f_Rome.pdf
Basically adding the concept of a royal family, marriages between royal families to seal an alliance, etc. Binding agreements as part of marriage contracts... that could unexpectedly come to an end if one of the couple dies early... but if they live long, the agreement you make one year could hurt you a lot down the road...
The big downside is that it's *complicated*. It would be pretty time-consuming for the GM... checking all marriage contracts for contradictory agreements, keeping track of all the royal families (could be done in Excel)... It would also be complicated for the players, but not horribly so...
GM's nightmare: combine this with one of the 30+ player whole world variants... yeah, I'll be shocked if anyone ever does that.

It sounds fascinating... but time-consuming. Has anyone ever played this?