In the fifteenth century that part of the Seine comprehended within the enclosure of Paris contained five islands: the Ile Louviers, then covered with trees and now with timber, the Ile aux Vaches, and the Ile Notre Dame, both uninhabited and belonging to the bishop [in the seventeenth century these two islands were converted into one, which has been built upon and is now called the Isle of St. Louis]; lastly the City, and at its point the islet of the Passeur aux Vaches, since buried under the platform of the Pont Neuf. The City had at that time five bridges: three on the right--the bridge of Notre Dame and the Pont au Change of stone, and the Pont aux Meuniers of wood; two on the left--the Petit Pont of stone, and the Pont St. Michel of wood; all of them covered with houses. The university had six gates, built by Philip Augustus; these were, setting out from the Tournelle, the Gate of St. Victor, the Gate of Bordelle, the Papal Gate, and the gates of St. Jacques, St. Michel, and St. Germain. The Ville had six gates, built by Charles V, that is to say, beginning from the Tower of Billy, the gates of St. Antoine, the Temple, St. Martin, St. Denis, Montmartre, and St. Honoré. All these gates were strong, and handsome, too, a circumstance which does not detract from strength. A wide, deep ditch, supplied by the Seine with water, which was swollen by the floods of winter to a running stream, encircled the foot of the wall all round Paris. At night the gates were closed, the river was barred at the two extremities of the city by stout iron chains, and Paris slept in quiet.
A bird's-eye view of these three towns, the City, the University, and the Ville, exhibited to the eye an inextricable knot of streets strangely jumbled together. It was apparent, however, at first sight that these three fragments of a city formed but a single body. The spectator perceived immediately two long parallel streets, without break or interruption, crossing the three cities, nearly in a right line, from one end to the other, from south to north, perpendicularly to the Seine, incessantly pouring the people of the one into the other, connecting, blending them together and converting the three into one. The first of these streets ran from the Gate of St. Jacques to the Gate of St. Martin; it was called in the University the street of St. Jacques, in the City Rue de la Juiverie, and in the Ville, the street of St. Martin; it crossed the river twice by the name of Petit Pont and Pont Notre Dame. The second, named Rue de la Harpe on the left bank, Rue de la Barillerie in the island, Rue St. Denis on the right bank, Pont St. Michel over one arm of the Seine, and Pont au Change over the other, Gate of St. Martin; it was called in the University to the Gate of St. Denis in the Ville. Still, tho they bore so many different names, they formed in reality only two streets, but the two mother-streets, the two great arteries of Paris. All the other veins of the triple city were fed by or discharged themselves into these....