The Queen and Duke of Edinburgh were shown around a £19 million state-of-the-art resource centre.
Her Majesty officially opened The Keep, near Falmer, which will provide a home for archives and historical resources of East Sussex and Brighton and Hove.
Archivists showed the royal delegation maps of Sussex from 179, historic pictures of Eastbourne before it became a resort.
- UPDATE: Pavilion Gardens in Brighton sealed off after man stabbed in the back
- Volunteers needed for Brighton's Color Run this afternoon
- Parents’ shock at STI tests offered to 15-year-olds in Brighton and Hove schools
- What could be the lasting impact of the Scottish referendum for the people of Sussex be?
- Sussex MP blasts 10% pay rise which would add £7k to their salaries as ‘out of touch’
Other achived included photos of Brighton Carnival stretching along Madeira Drive and its oldest document, Battle Abbey Charter, from 1101.
Senior Archivist Chris Whittick said: “They both showed a great interest in what he had shown them and they made most perceptive comments.
“We tried to select documents that would be of interest but not too personal. I think we got the right balance.”
Around two hundred royal watchers waited at Woollards Field, Moulsecoomb, for the royal cavalcade to arrive.