Louis II, Prince of Monaco
On 26 June 1922, Prince Albert I died in Paris. Louis Grimaldi ascended to the throne as Louis II, Prince of Monaco. While his reign never achieved the grandeur of his father, Louis II left an indelible imprint on the tiny principality. In 1924 the Monaco Football Club was formed and in 1929, the first Grand Prix of Monaco automobile race was held, won by Charles Grover (aka "Williams") driving a Bugatti painted in what would become the famous British racing green color. He collected artefacts belonging to Napoleon I which are now assembled and displayed in the Napoleon Museum attached to the Royal Palace in Monte Carlo.
Wilhelm Karl, Duke of Urach
Through his mother, Wilhelm was a legitimate heir to the throne of Monaco. Wilhelm's cousin Prince Albert I of Monaco had only one son, Louis, who was unmarried and had no legitimate children. The French Republic, however, was reluctant to see a German prince ruling Monaco. Under French pressure, Monaco passed a law in 1911 recognising Louis's illegitimate daughter, Charlotte, as heir; she was adopted in 1918 by her grandfather Prince Albert I as part of the Monaco Succession Crisis of 1918. Wilhelm was relegated to third in line to Monaco's throne, behind Louis and Charlotte. Furthermore, in July 1918 France and Monaco signed the Franco-Monegasque Treaty; it required all future princes of Monaco to be French or Monegasque citizens and secure the approval the French government to succeed to the throne. After the accession of Prince Louis II in 1922, Wilhelm renounced his rights of succession to the throne of Monaco in favour of distant French cousins, the counts de Chabrillan, in 1924.