I find a sledgehammer, block of wood and a souce of fire is a good way to keep prisoners from running. No feet. No running. Oh wait...that only is an option for a C/E character.
Manacles are good though. If you don't have that then do the fantasy version of what we called in the Army "POW handcuffs" or "prussic hand cuffs." You have to use 550 cord and there is a way of wrapping it so that it acts like a very, very, very effective handcuffs. In my campaign world there is a plant that when made into a rope or thick twine it makes a good lasso that when you struggle it tightens up on you more. It is a alchemtical rope thingee. That may be an option for rope to restrain someone.
Aries