Who's the Hermit in The Horse and His Boy? Narnia Lore - Origin Theory

"The Hermit of the Southern March is one of the most mysterious yet important characters in Narnian history. In The Horse and His Boy, he rescued Shasta and Travis and served Aslan and the Pevensie siblings along the way. But who was he? Where did he come from? Uncover the hidden storey in this video, and consider a theory about his true origins." from the video introduction