YouTuber Alt Shift X has a crazy insane fan theory that suggests that Howland Reed is in fact The High Sparrow. Before you get all up and arms, just listen. There is some evidence throughout the series and George R.R. Martin‘s saga, that suggests that instead of staying in the North after the Targaryen’s were dethroned, Howland traveled to King’s Landing and quietly rose to power through the Faith of the Seven. Think about it. The Faith of the Seven is a fairly new religious order, that began gaining traction as things in King’s Landing began to fall apart. Also, the High Sparrow is also obviously not here for the Lannisters and their bullshit. He locked Cersei up and paraded her nude through the streets. He also locked up Margaery and Loras and he now has Tommen on a leash. Howland Reed was known to be a man of action. He certainly would not be someone to sit by idly as all of Westeros went to hell, certainly not after his BFF was beheaded. He would definitely want vengeance.