I would like to cast doubt on the claims made by the poster Ghost of Senlac.
Firstly, his claims to be a ghost are almost certainly untrue. Ghosts are not immortal, and tend to deteriorate after around 400-500 years, sometimes less. Therefore we must draw the conclusion that our friend is a solid and physical entity, composed of flesh and blood, just like you and me.
It is also doubtful whether he was ever at Senlac Hill, as he claims. See www.bbc.co.uk/news/magazine-15305391