At a short distance from what was formerly the Île Louviers, the Seine throws out on the right an arm, which, before rejoining the main stream, forms the island of Saint-Louis. In the seventeenth century this island was augmented by being joined to two smaller ones; the island of Cows on the east, and the island of Notre Dame (the property of the cathedral) on the west; and the triple island received the name of Île Saint-Louis in honour of the great king. The island of Saint-Louis communicates with the left bank, from which the main stream separates it, by the foot bridge of Constantine and the bridge of Latournelle. The bridge of Constantine owes its name to the town taken by the French in 1836. It is only available for pedestrians. The ancient bridge of Latournelle, constructed in 1614 on the site of a still older one, was in wood. After being several times destroyed in this form, it was in 1656 reconstructed in stone. In 1831 a band of thieves who had robbed the royal library of many valuable medals, threw their booty from the Pont de Latournelle into the Seine, whence the greater part of it was recovered by divers. Close to the Pont de Latournelle is the Pont Marie, of which the first stone was laid in 1614 by Louis XIII. and Marie de Medicis. The bridge, however, is said, according to a somewhat improbable statement, generally accepted by the historians of Paris, to owe its name, not to the queen, but to Marie, a well-known builder of the time. The next bridge, as we continue to descend the stream, is the Pont Louis Philippe, the date of which is indicated approximately by the reign under which it was built. Begun in 1833, it was finished in 1834, but since then has undergone many restorations and modifications. The bridge of Saint-Louis, which joins the two islands, replaces the second section of the original Louis Philippe bridge, at one time known from its colour as the Red Bridge.