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.
Monaco succession crisis of 1918
Duke Wilhelm von Urach, along with the other adult descendants of Princess Florestine, renounced their dynastic rights in 1924, but did so in favor of a French cousin, Léonor Guigues de Moreton, "comte" de Chabrillan, who was descended from Prince Joseph of Monaco. The count was a more remote, female-line descendant of the Grimaldi dynasty, and was next in line to the Monégasque throne after the Urachs according to the pre-1920 order of succession. Thus, while the duke voluntarily withdrew as a claimant to Monaco's throne (he had also been considered for the thrones of Lithuania and Alsace-Lorraine, although these monarchical opportunities never materialized), he did not choose to recognize Monaco's "selected" heir – perhaps unsurprisingly, since the 1918 law and treaty directly intruded upon his hereditary rights, excluding him from a throne for no personal act of dereliction on his part, and without compensation ("cf." Prince Ingolf of Denmark).