Offa was born in 702. In 757, Offa been the head of the Mercia dynasty. And the Offa converted the Mercia dynasty into a kingdom.
The Offa was the first to end internal rebellions. At that time, the Offa waged war to expanding Mercia's territory. The Offa has followed a peaceful policy when he thinks Mercian reaches its maximum limits. The King Offa has taken defensive measures to the Mercia borders and built walls on the borders.
The Offa has made an agreement with the Frank state. On this count, Offa prevented the Franks from attacking Mercia. Offa has also made an agreement with the Pope. And the Offa spread Christianity to the people of Mercia.
Offa died in 796.