Jock of the Side or Jock O' the Side is a border ballad existing in several variants, and is part of the series of 305 traditional songs of England and Scotland known as the Child ballads, having Child number 187.
[1] The rescue it depicts is recorded solely in popular tradition, although Jock of the Side himself appears to have existed.
Hobie Noble—in some variants his illegitimate half-brother, and in some an outlawed Englishman—set out with few men to rescue him.
They sneak into the castle, over the hall or by murdering the porter, and find and rescue him.
In some variant, once they have escaped by crossing a river, the former captor asks for the chains back, but the prisoner says he will use them to shoe horses.