Mlp fim theories, Cannon, and questions

[pintomint]

Well I think we all can contribute to this!
Now sense I've joined I see not many ponies contribute to conversation here so lets get started.
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Now this book is about the story about the founding of Hearts and hooves day, a Valentine esc holiday founded when an unknown Prince gave a love poison to a neighboring unknown Princess, where as there lack of being able to complete there royal duties plummeted there kingdoms into chaos.
Hmmm? Who could this "alicorn" princess be?
This video by Tommy Oliver (A.K.A) Brony curious, explains the history of equestrian from the joining of the three tribes to the di celestial Monarchy. In here is the timeline given to us by the show and sorted out by our fellow brony.
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Annnyyyy thoughts?~