Regarding John Smith and Pocahontas' marriage:
This is only a rumor, but someone has done "genealogy" for this "couple." There is truth to John Smith's existence and that he did encounter Pocahontas. However, the Powhatan Nation denies a romantic relationship happened between them, that Pocahontas was a 10 (or 11) year old child when they met. She gave him food and helped some of his co-workers.
It was after Pocahontas had passed and her fame was both in the Americas and in England that John Smith had come forth with his story of a relationship between he and Pocahontas.
The genealogy on this site from a union between John SMITH and Pocahontas SUNACOCK, Powhatan Princess is unconfirmed and rumor.