From the introduction:
A roleplaying game of outlaw scum in an Anglo-Saxon world
An alternate rules set for Swords & Wizardry: Whitebox
The world of Rædwald is a world where the bond of the warband, the oath of loyalty between warrior and king, your word, your honour and your status means everything. It is a world where family, community, and the king's laws are a shield against misfortune.
This early playtest version of the game was an adaptation of Swords & Wizardry; it would evolve into a completely new system.