The historical interest attaching to the buildings of this institution is very considerable. As far back as the time of Clovis, there was a hunting-lodge on this site; this was transformed, under the Carlovingians, into a debtors' prison. About the commencement of the twelfth century, this collection of ancient buildings was used as a hospital for lepers, under the appellation of Saint-Ladre [Saint Leper], standing near the road from Paris to Saint-Denis. In the year 1147, Louis VII, setting an example followed nearly a century later by Saint-Louis, visited this lazaretto, before setting out for the Crusades. "This was an action praiseworthy and very little imitated," says the chronicler. The hospital counted among its revenues the profits arising from an annual fair, known as that of Saint-Ladre; Philippe-Auguste, in 1183, annexed the proceeds of this fair to the royal revenues, and transferred it to the interior of Paris, where it became famous under the name of Saint-Laurent. In return, he provided the hospital with an annual revenue. Among the buildings attached to the hospital was one known as the _Logis du Roi_, where the sovereigns were in the habit of halting to receive the oath of fidelity from their good citizens of Paris before making their solemn entry into the capital. This was also the principal halting-place for the royal funeral cortèges on their way from Paris to Saint-Denis; and as late as 1793, when it was demolished by the all-demolishing Revolution, a Gothic tower standing here perpetuated the first rest made by Philippe le Hardi in his pious transportation on his shoulders of his father's coffin to its final resting-place.