The location here is where he won all of his money.
Joseph Hobson Jagger (1830–1892) was a British engineer, widely known as The Man Who Broke the Bank at Monte Carlo, though he is not the only person to have done so. His name is sometimes reported as Jaggers, but the International Genealogical Index indicates that Jagger is more likely. He is also said to be a distant cousin of Mick Jagger of the Rolling Stones.