William John Trounce (son of William Trounce, accountant and ship broker, and Mary Rowe) was born in Penzance, Cornwall, and died in Cardiff. He married Florence Thomas on 1863 in Cardiff.
William entered a ship broker's office in Nantes, France; in 1863 he returned to join his family in London. The same year, he moved to Cardiff, to start a ship brokers office, where he lived with his parents in Womanby Street. He became the owner of the ships Nelson, Brittany and Express. By 1890, he was an agent for Thomas Cook & Sons. In 1878, he was elected to Cardiff Council, being elected Lord Mayor in 1893. As Cardiff's representative, he was present at the opening of the Manchester Ship Canal and the Tower Bridge in London. In 1895, he was appointed Justice of the Peace. Author of "Cardiff in the Fifties".
Source Genealogy.com