Quote (Jaliy @ Oct 6 2013 01:50pm)
so all the men will be called prince? i thought once u hold the crown u r the king
You should consider thoroughly rereading the books and pay attention to lore or at least go through the Wiki page for A Song of Ice and Fire.. (http://awoiaf.westeros.org/index.php/Main_Page )
Anyhow, the only king in the Seven Kingdoms is the king on the Iron Throne, below him are the Great Houses (Among them House Martell).. The ruling lords of House Martell style themselves "Prince" and "Princess", though they're not in (Immediate?) succession for the Iron Throne.
If you wish to know how the hereditary titles work, you can probably just look up the English laws/rules as A Song of Ice and Fire is based off the War of the Roses.