Book excerpt: No one knows for certain when Bristol was founded. What we do know is that for more than 1,000 years it has been at the centre of national and international history. From its earliest days Bristol's prosperity was linked to its port, with the importation of wine and tobacco and its involvement with the slave trade. In those days, explorers sailed from Bristol on epic voyages and discovered new lands. In more recent times its economy has been built on creative media and the aerospace industry, including the construction of Concorde, the world's first supersonic aircraft. From the Avon Gorge's formation, Iron Age settlers and Norman castle construction, to civil war, riots and bus boycotts, The Little History of Bristol is guaranteed to enthral both residents and visitors alike.