Red Wizard: what's up with Thoros?

In Season 3 of Game of Thrones, Thoros of Myr turns up, performs a resurrection, and isn't seen again. Who is this guy? Where does he come from? How is he involved with Robert Baratheon, Beric Dondarrion, and Lady Stoneheart?

This video contains spoilers for Book 5 / Season 5.

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Art by Ertaç Altınöz: http://ertacaltinoz.deviantart.com/

Created with Adobe After Effects, a Wacom Intuos Pen Tablet, and a Blue Yeti microphone.
Images and video from Game of Thrones used here under fair use.

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