I have just started a game as the Habsburgs, and I have the misfortune of staying as Count while the HRE has the title of Duke of Upper Burgundy. Is there anyway to coax him into giving it to the rightful ruler (me)? 
One thing that is confusing about petitioning your liege for a promotion is the *desires duchy of x condition... I want duchy x but for whatever reason my character is apparently happy to remain a count
for some reason, the emperor has given me the duchy of sardinia 3 times out of the 3 that i played as habsburg within a year... why sardinia? i don't WANT saridnia damnit!
The title also sounds like a mathematical problem about fruit posed by an eccentric Duke that has frustrated mathematicians for centuries.