Pontage was granted by the king by letters patent for a limited term, sufficient to enable the requisite public works to be done. However, sometimes the works were not completed (or at least not paid for) by the end of the term, so that a renewal had to be obtained. Grants were made from 1228 until the 1440s, the earliest being for bridges at Ferrybridge, Yorkshire and Staines, an important crossing of the river Thames. In all about 370 grants were made. In the Lordship of Ireland, grants of pontage were used to build bridges in many towns, including Clonmel, Kilcullen and Leighlinbridge.
- "BRIDGES (Medieval Ireland)". what-when-how.com.
- O'Riordan, David (15 November 2016). "Revealing the hidden medieval history of Clonmel's Old Bridge".