"The Ha'penny Bridge (Irish: Droichead na Leathphingine, or Droichead na Life), known later for a time as the Penny Ha'penny Bridge, and officially the Liffey Bridge, is a pedestrian bridge built in May 1816 over the River Liffey in Dublin, Ireland.[2][4] Made of cast iron, the bridge was cast at Coalbrookdale in Shropshire, England
Originally called the Wellington Bridge (after the Dublin-born Duke of Wellington), the name of the bridge changed to Liffey Bridge. The Liffey Bridge (Irish: Droichead na Life)[1] remains the bridge's official name to this day, although it is most commonly referred to as the Ha'penny Bridge...Before the Ha'penny Bridge was built there were seven ferries, operated by a William Walsh, across the Liffey.[2] The ferries were in a bad condition and Walsh was informed that he had to either fix them or build a bridge. Walsh chose the latter option and was granted the right to extract a ha'penny toll from anyone crossing it for 100 years." Wikipedia