500 A. D,

By 500AD, in the Celtic period, the climate had turned wetter and the bogs became more marshy again. With no decomposition of waste, the bog's dome continued to rise, becoming much higher than the surrounding landscape. As the bogs were now too wet to walk upon, let alone graze animals on, some Iron Age farmers built wooden walkways over them. By 1000 A.D. farming had moved to the lower ground.

Hayden and Marcus