The only written evidence we have about Boudica comes from the Roman historian Tacitus , whose father-in-law Agricola actually served in Britain. Tacitus was writing fifty years after the events he was describing but probably spoke to Agricola and had access to other accounts. A later historian, Dio Cassius, also wrote about Boudica, basing much of his history on Tacitus. As these sources were hostile to Boudica they may be biased in their descriptions of her. Archaeologists have found signs of the destruction and burning of the Roman cities of Colchester, St Albans and London from the time of the revolt.