Albert II, Prince of Monaco
As Monaco's head of state, Prince Albert II is depicted on coins, including collectors' coins, with very rare exceptions. One of the most recent examples is the €5 silver Prince Albert II commemorative coin, the first commemorative coin with his effigy on it, minted in 2008. On the obverse, the prince is depicted in profile with his name on the top of the coin. On the reverse, the Grimaldi coat of arms appears; around it, the words "Principauté de Monaco" (Principality of Monaco) also appear along with the nominal monetary value of the coin.As the prince, his official shortened title is "His Serene Highness Albert II, Sovereign Prince of Monaco"; this does not include the many other styles claimed by the Grimaldi family.
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).