In his youth, practically enslaved by a pegasi couple from Canterlot that "took him in" for "his best". Due to this, now is very sceptical to any pegasi.
At one point he was able to run away and then spent most of his life alone in Everfree Forest, staying away from others, social skills at an absolute minimum. All he knows is from ponies accidently roaming around in the forest and observing them.
Recently gained some social skills after Cirrus convinced him to visit Canterlot again and doing his best to fit in.
Real origin prior to the adoption unknown.