Princess Marguerite arrived in France escorted by a brilliant embassy, and the marriage was celebrated at Sens, on the 27th of May, 1234, amidst great rejoicings and abundant largess to the people.

As soon as he was married and in possession of happiness at home, Louis of his own accord gave up the worldly amusements for which he had at first displayed a taste; his hunting establishment, his games, his magnificent furniture and dress, gave place to simpler pleasures and more Christian occupations.

The active duties of the kingship, the fervent and scrupulous exercise of piety, the pure and impassioned joys of conjugal life, the glorious plans of a knight militant of the cross, were the only things which took up the thoughts and the time of this young king, who was modestly laboring to become a saint and a hero.
There was one heartfelt discomfort which disturbed and troubled sometimes the sweetest moments of his life.

Queen Blanche, having got her son married, was jealous of the wife and of the happiness she had conferred upon her; jealous as mother and as queen, a rival for affection and for empire.

This sad and hateful feeling hurried her into acts as devoid of dignity as they were of justice and kindness.