Well, it's just a title I took, just like the Kings of England named their heirs princes of Wales. Even if they simply conquered the land. If you like you can claim similar titles, in the end it does not matter what your titles are... The King of Spain for example claims to be King of Jerusalem, Two sicilies and Duke of Neopatras, which practically is not true... Well, I think that NightAngel simply donated you his coins, not his lands. If he donated you his house, thought, you don't even need to pay for its repair, but if he doesn't you simply don't own it and you need to pay to keep it standing of get paid to demolish it...
Btw, please, think of the new treaty. We have to decide of what will be done with Guildmasteria, or we will soon see agression, war and damage done to our small states...