Llangollen flow. The bridge was also widened in 1873 and again in 1968, using masonry which blended in with the older structure. It is a Grade I listed structure and a Scheduled Ancient Monument. On the outskirts of the town is Plas Newydd ("New Mansion" or "New Place"), from 1780 the home of the Ladies of Llangollen, the Honourable Sarah Ponsonby, Lady Eleanor Butler and their maid Mary Caryll. The Pillar of Eliseg is another old monument. There is an electoral ward of the same name. This ward includes Llantysilio community and has a total population taken at the 2011 census
William Ponsonby, 2nd Earl of Bessborough 1765 jointly with Thomas Robinson, 1st Baron Grantham, until he resigned in 1766, his initial offer to resign having been refused. Upon William Ponsonby's death on 11 March 1793 his son, Frederick Ponsonby, succeeded to his titles. William Ponsonby was the son of Brabazon Ponsonby, 1st Earl of Bessborough, and his wife Sarah Margetson, and elder brother of John Ponsonby. On 5 July 1739 William married Lady Caroline Cavendish, eldest daughter of William Cavendish, 3rd Duke of Devonshire, who died in 1760 aged 40. They had three surviving children: Parkstead House, Roehampton, was built in 1750 for William Ponsonby, and