Half a millennium before the Romans first arrived in Britain, an even more ferocious people, the Celts, arrived in what is now south-eastern England. The Celts remained in Britain long after the Romans departed, and although driven into the remoter corners of the island by English invaders the people who remained clung onto their Celtic heritage, and defended their remaining lands against all-comers. In order to defend their lands from other tribes or outside invaders these people established powerful fortified sites that served as places of refuge in wartime and as administrative and trading centres in times of peace. This book examines these fascinating forts, which varied considerably from the mysterious brochs and duns found in northern Britain, to the hill-top forts ranging in size, to the promontory forts that formed powerful coastal strongholds all around the island's shores.

Angus Konstam is a Fellow of the Royal Historical Society and has written widely on naval history, with well over a hundred books in print. He is a former Royal Navy officer, maritime archaeologist and museum curator, who has worked in the Royal Armouries, Tower of London, and Mel Fisher Maritime Museum. Now a full-time author and historian, he lives in Orkney.