In this period, Quinquempoix began to see an extension of the château's functions. It was home to a chapel devoted to Saint Germain mentioned as early as 1219, which disappeared in the 17th century with the extension of the château's gardens. Several houses were built in Quinquempoix to accommodate the prince's court officials. Also, the hôtel de Beauvais, built in 1539, lodged the master of the hunt of constable (connétable) Anne de Montmorency. The hôtel de Quinquempoix, built around 1553, housed the constable's equerry.