The Ile St-Louis was originally two smaller islands: the Ile aux Vaches (Island of the Cows), originally nothing but pasture; and the Ile Notre-Dame, site of judicial duels during the Middle Ages. It wasn't until the 17th century that the 2 islands were united. The work was done by Marie, a general contractor, and his 2 sponsors, Le Regrattier and Poulettier. After the construction, lords and financiers built their homes here. As a result, the Ile St-Louis remains a lovely place to walk around and admire the mansions, still standing.