 Since Mary had been considered betrothed to John since birth, she was now, at the age of one, titular Duchess of Brittany.Mary and John spent their childhood together at The Tower, Langley, Eltham, Woodstock, Sunning, Clarendon and other royal palaces.There is only one record of Mary ever leaving the court household and that was to visit her brother John of Gaunt and his wife Blanche, who had just had their first child.