The South Bull Wall ( another word for strand, or sandbank) was constructed in the 1753 (after a particularly bad winter), to protect shipping coming into Dublin. as the bay was famously wild, silted, and difficult to cross. The Poolbeg Lighthouse at the end of the Bull Wall was lit for the first time on 29 September 1767. It replaced a floating light that had been placed at the end of the wall to warn ships.