Meanwhile a congress had been held at Calais, under Henry VIII.'s mediation, with a view to settling all differences and establishing peace. Henry gave Wolsey full powers to arrange the negotiations, but the Cardinal, anxious to please both Francis and Charles, ended by satisfying neither, and the congress broke up without any definite result. During its progress Wolsey journeyed to Bruges and had a meeting there with Charles and Margaret, the latter having come in hot haste to visit her nephew, anxious to use her influence to procure an armistice. The Cardinal was received by the emperor and his aunt with as much respect and magnificence as though he had been King of England, but instead of furthering the treaty of peace, Wolsey, in his master's name, concluded a secret alliance with the emperor against France. This treaty, which was drawn up at Bruges on August 25th, 1521, and signed by Margaret and Jean de Berghes for the emperor, and by Wolsey for the King of England, arranged a marriage between Charles and his cousin Mary Tudor (King Henry's only child and apparent heir) as soon as the princess should have completed her twelfth year; both Charles and Henry agreeing to invade France in the spring of 1523 from opposite sides, each with an army of 40,000 men--the emperor promising to visit England on his way to Spain early in the following year. It was especially stipulated that 'one month before Charles undertook the voyage he would notify the time of it to the King of England, who would then send his fleet to sea, with about 3000 armed men on board, to drive away all enemies and pirates from the Channel and English seas, so that the emperor might safely come over to Dover or Sandwich. The King of England would receive the emperor with the greatest honour and accompany him to Falmouth, whilst the English navy would escort the emperor's fleet from Zealand to Falmouth, and together remain in that port until he embarked and then accompany him to Spain.'[75] [75] _Calendar of Spanish State Papers_, vol. ii. During the years that had passed since Margaret left Savoy she never lost interest in the memorial church she was building at Brou. In September 1521 she sent her treasurer Marnix and some members of her Council to report on the progress of the work. The church was rapidly gaining shape, and the outer walls were nearing completion under the skilful direction of Louis Van Boghen. The following letter from Loys de Gleyrens, prior of the monastery of Brou (written to Margaret on the 2nd of September 1521), gives a detailed account of de Marnix's visit:--