The reign of King<span> John shows what often happened in the Middle Ages when a </span>king<span>lost a war – his authority was completely wrecked. The </span>English<span> barons rebelled and, on 15 June 1215, they forced John to agree to </span>Magna Carta<span> - a set of demands by which the barons tried to </span>limit the power<span> of the </span>king<span> to their advantage.</span>
