Jeannie

Well done again ... my notes:

500-600 - FALSE (by 200 years) - Offa caused the earthwork that still bears his name, Offa's Dyke, to be built. It stretches the 150 mile length of the Welsh border. Begun in the 780's, the purpose of the dyke seems to have been as a fortified frontier barrier, much as Hadrian's Wall had been some six centuries previously.

:-)
Ian