He worked with Cardinal Wolsey to form an alliance between Francis I and Henry VIII in 1527.
Within two years of his arrival he was drawing a project for a decor commemorating Anne de Montmorency (preparatory drawing at the Louvre).
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Floris had a military training at the court of his relative Anne de Montmorency, Constable of France.
In 1559 he was hired along with François Clouet and Guyon Ledoux to make armorial bearings for the funeral of Henry II, and in 1564, by Constable Anne de Montmorency to work at the Château d'Écouen, although there is no evidence that he was given any important projects there.
The Château d'Écouen, built for Anne de Montmorency, became the National Museum of the Renaissance in 1977.
He had letters of recommendation from James V to Eleanor of France, the Queen of Navarre, Madame Aubigny and Robert Stuart, sieur d'Aubigny, the Chancellor Antoine Duprat Cardinal of Sens, the Admiral Philippe de Chabot, the Grand Master Anne de Montmorency, and the French Secretary Jean le Breton, sieur de Villandry.