Who is Bloodraven? What role has he and will he play in the books

Why did Bloodraven take the black? In “Tales of Dunk and Egg” he was Hand of the King, so how did he get to the Wall? - Quora

Three-Eyed Raven, Wiki of Westeros

Game of Thrones': Bran Stark's Time Traveling and Warging Abilities

Time Travel & Bloodraven's Influence on House Targaryen In Westeros

Are Bloodraven and the three eyed crow the same person? - Quora

Who is Bloodraven? What role has he and will he play in the books and whose side is he on? - Quora

Brynden Bloodraven Rivers, Wiki

Game of Thrones' Trailer Teases Bloodraven Storyline

I have my own ghosts, Bran. A brother that I loved, a brother that I hated, a woman I desired. Through the trees, I see them still, but no word of mine