Mulan is not actually a princess by blood or marriage, but she is pictured in the Disney princess collection. Pocahontas wasn't necessarily a princess, but she was a Native American chief's daughter.
In Sleeping Beauty, Briar Rose/ Aurora was born royalty, though she lived as a peasant girl most of her life. Snow White was either born royalty, or was royalty through her step-mother or father....
All Disney princesses un-featured in the 'Princesses' merchandising line: Minnie Mouse- She is a Princess, she is the first and she plays one in many cartoons. Tigerlilly- Peter Pan Faline- Bambi...