King of the Anglo-Saxon kingdom of Mercia from 757-796 (4)

I believe the answer is:

offa

(Other definitions for offa that I've seen before include "Dividing wall builder" , "Mercia's dyke builder" , "man throwing up defence" , "One-time ruler" , "Eighth century king of Mercia" .)

I've seen this clue in The Mirror.

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