With the development of commercial Dublin in the 17th century, four new bridges were added between 1670 and 1684: Barrack, or Bloody Bridge, (the forerunner of the current Rory O'More Bridge), Essex Bridge (Grattan Bridge), Ormond Bridge (O'Donovan Rossa Bridge) and Arran Bridge. The oldest bridge still standing is Mellows Bridge, (originally Queens Bridge) constructed in 1764 on the site of Arran Bridge, which was destroyed by floods in 1763. The first iron bridge was the Ha'penny Bridge built in 1816.