Only the historical ones please. I have searched a bit myself and the list is now a bit shorter. During my search I learned that some titles did not exist at all times and I'm getting the idea that not all shires had dukes or earls and some shires might even share a noble.

I had the idea that each shire had its own heraldic shield which could nicely function as an interface element. But what if we can't find the heraldry of a duke simply because there was no duke? Shall we take the heraldry of a famous Lord?

I'm not from England so this is all new from, but the heir of the English King gets the Duke of Cornwall plus the Prince of Wales titles. I read a few times about Edward, the Prince of Wales recruiting the men from the West and I always thought that it would mean men from Wales, but it probably means Cornish men. Richard Neville was Earl of Salisbury and Warwick. What to do with nobles who have two titles?

What to do with the titles of dead heirs? Should they become regular nobles? Or remain vacant?