Albert II, Prince of Monaco
Prince Albert II is one of the wealthiest royals in the world, with assets valued at more than $1 billion, which include land in Monaco and France. Although Prince Albert does not own the Prince's Palace of Monaco, he does own shares in the "Société des bains de mer de Monaco", which operates Monaco's casino and other entertainment properties in the principality.
Princess Marie Amelie of Baden
In 1869, her only daughter Lady Mary Victoria Hamilton married Prince Albert (later Albert I), son and heir of Charles III, Prince of Monaco. The union was unhappy, however, and Mary left Monaco and her husband after giving birth to an heir, Louis II. The marriage was annulled in 1880. She later married the Hungarian magnate Prince Tasziló Festetics, living from that point onwards mainly in her husband's native country. Through Mary, Marie is the great-great-grandmother of the current reigning prince of Monaco, Albert II. 
The Duke and Duchess of Hamilton had the following issue, two sons and one daughter: