Britain was once a mosaic of small kingdoms, some of which have vanished without a trace. In his new book Lost Realms, Thomas Williams, uncovers the forgotten stories of nine kingdoms that fell while others - such as Wessex, Mercia, Northumbria and Gwynedd - prospered.

In this episode of Gone Medieval, Dr. Cat Jarman talks to Thomas Williams whose close scrutiny of Britain’s ancient landscape has resurrected a lost past.

This episode was edited by Thomas Ntinas and produced by Rob Weinberg.

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