Thanks for taking the time to reply. As I remember from my studies the "Internal" martial arts are a off shoot of Shaolin.
I'm not up to speed on when Xingyi, Taiji, and Bagua were created. Thanks for the names of the martial historians. I shall do a little more research.
Also, the idea of "internal" martial arts did not appear until the mid-seventeenth century. The "Internal school" of martial arts was created by a man with ties to people involved in Taoist rebellions against the Manchu government. The "internal" part of the name referred to the Chinese. This school appeared and even died out (if I remember correctly) well before the creation of Xingyi, Taiji, and Bagua.
I suggest you look into the scholarly works of such martial historians as Meir Shahar, Stan Henning, Tang Huo, Lin Boyuan, etc. for more details.