Avondale's fish and Clarence's poison

• Prince Albert Victor, Duke of Clarence and Avondale: (1864–1892) the eldest son of Albert Edward, Prince of Wales (later King Edward VII) and Alexandra, Princess of Wales (later Queen Alexandra), and the grandson of the reigning monarch, Queen Victoria. he was engaged to be married to Princess Mary of Teck in late 1891. Just a few weeks later, he died in an influenza pandemic. Mary later married his younger brother, George, who became King George V in 1910.
• Avon: a river in England
• Fish: a river in southern Africa in present-day Namibia
• Clarence: a river in Australia
• Avondale: a town in County Wicklow, Ireland, the birthplace and home of Charles Stewart Parnell (1846–1891) one of the greatest political leaders in Irish history.
• "one man's meat is another man's poison" (proverb)
• one man's fish is another man's poisson: poisson being French for fish