The Cloisters are so named on account of the five medieval French cloisters whose salvaged structures were incorporated into the modern building, and the five thousand objects at the Cloisters are strictly limited to medieval European works. The collection features items of outstanding beauty and historical importance; including the "Belles Heures of Jean de France, Duc de Berry" illustrated by the Limbourg Brothers in 1409, the Romanesque altar cross known as the "Cloisters Cross" or "Bury Cross", and the seven tapestries depicting the Hunt of the Unicorn.