According to Wikipedia, the franchise does not include all princess characters from the whole of Disney-owned media, but rather refers to specific characters from the company's animated films. As of 2017, the eleven characters considered part of the franchise are (left to right below) Jasmine, Rapunzel, Snow White, Mulan, Aurora, Cinderella, Pocahontas, Tiana, Belle, Ariel, and Merida.
The original line-up consisted of princesses Snow White, Cinderella, Aurora, Ariel, Belle, Jasmine, Pocahontas, Mulan and Tinker Bell. Five of them (Snow White, Aurora, Jasmine, Pocahontas, and Ariel) were royal by blood, two (Cinderella and Belle) married into royalty, and two (Mulan and Tinker Bell) fit the "princess mythology."
March 14th, 2010: Tiana officially became the first additional character to the Princess franchise, taking Tinker Bell's short-lived place as the ninth member. Tinker Bell was already heading up another franchise started in 2005 . . . Disney Fairies.
October 2nd, 2011: Rapunzel was "crowned" and inducted into the Disney Princess franchise as the tenth member.
May 11th, 2013: Disney added the first Pixar character Merida as the 11th Princess to the franchise.
Whether Anna, Elsa, Moana and Lilo are officially "crowned" is yet to be seen.
These are some of my little Disney darlings who I have been knitting for. I also have Elsa, Merida, Tinker Bell and Arial, but I'm not sure if they will be wearing the same knitted sets yet.
When purchasing Disney Animator dolls, please be aware there are fakes out there and if you want to know how to tell the difference, check this out!