Red Wizard: whats up with Thoros?

In Season 3 of Game of Thrones, Thoros of Myr turns up, performs a resurrection, and isnt seen again. Who is this guy? Where does he come from? How is he involved with Robert Baratheon, Beric Dondarrion, and Lady Stoneheart?\r
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This video contains spoilers for Book 5 / Season 5.\r
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Art by Ertaç Altınöz: \r
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Created with Adobe After Effects, a Wacom Intuos Pen Tablet, and a Blue Yeti microphone.\r
Images and video from Game of Thrones are the property of their creators, used here under fair use.\r
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Thanks to the following Patrons:\r
Reverend Xandria, @MrFifaSA, Cameron Weiss, @Vineyarddawg, Michael Appell, @AdamWritesPlays, Matthew Elisha Williams, Fred Petty, Jason Rattray, Madeline Cockrel.