Richard sent Edward and his brother to live in the Tower of London. A few months later, the princes in the tower disappeared and were never seen again. This became the mystery of the Princes in the Tower. At the time, many people believed that King Richard had ordered someone to kill them. Many historians agree, but there is no way to be certain. Richard was not in London at the time, but the boys were guarded by men who were loyal to him. As people started to believe that Richard had ordered the boys to be killed, many people turned against him. One of them was Richard's friend the Duke of Buckingham, who started a rebellion that failed. Henry Tudor, a distant relative of the House of Lancaster, then became Richard's main enemy. He returned to England and raised an army.