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.
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.