The Tour de Nesle or Nesle's Tower was a guard tower of the old city wall of Paris on the left (south) bank of the Seine. It was constructed at the beginning of the 13th century by Philip II of France. Old engravings show that there was a similar tall tower on the right bank of the Seine adjacent to the Louvre, therefore the towers may have together protected the upstream approach into the city.br/br/Originally known as the Tour Hamelin this was a cylindrical structure of approximately 10 metres in diameter. The height was around 25 metres, with a stair turret reaching higher still. Later on, the tower was incorporated into the H#244;tel de Nesle, a medieval mansion.