Who is the Knight of the Laughing Tree?

Twenty years before Game of Thrones, the biggest party in Westeros was held at Harrenhal – with Starks, Targaryens and Daynes in attendance. Who was the mysterious knight who fought for a young crannogman?\r
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This video contains spoilers for Game of Thrones up to Season 6 and Book 5.\r
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Created with Adobe After Effects and a Blue Yeti USB microphone: \r
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Images and video from Game of Thrones are the property of their creators, used here under fair use.\r
Images from The World of Ice and Fire used with permission from Random House.\r
Art by The Mico used with permission: \r
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Thanks to the following Patrons: Jason A. Diegmueller, Reverend Xandria, @MrFifaSA, Cameron Weiss, @Vineyarddawg, Eric Louis-Dreyfus, Jason Rattray, Kate Lyons, Ryan Steele, Michael Appell, Thee Stevie Franchise, Kevin Donohue, Matthew Elisha Williams, Otter, David Howe, Fallon Mail, Cregg Riley, Sean Ludtke, Chris Cole, LightCraft Miniature Studios, Jake Burling, Fred Petty, Chris Amolsch.