II. Prince Rainier of Monaco, full name Grimaldi Rainier Lajos Henrik Maxence Bertrand, born on May 31, 1923 in Monaco and died there on April 6, 2005, nobleman from the Grimaldi house, Count of Polignac, reigning Prince of Monaco from 1949 until his death. His father Péter, duke of Valentinois (1895–1964), his mother Sarolta, duchess of Valentinois (1898–1977), II. She was the illegitimate daughter of Louis. Prince Rainier took over the throne in 1949 from his maternal grandfather, II. From Prince Louis of Monaco. His mother, Princess Sarolta, II. She was the illegitimate daughter of Louis, so she could not inherit the throne. During his more than half-century reign of 55 years, Prince Rainier brought about significant changes in Monaco. In 1962, he adopted a new constitution that modernized the duchy's institutions and responded to social changes. His wife, Princess Grácia, born Grace Kelly, was an American actress, with whom he was married from 1956 to 1982 (until his death). Their children: Princess Caroline of Hanover, II. Prince Albert of Monaco and Princess Stefanie of Monaco. After the death of Prince Rainier, his son II. Albert took over the throne and is currently the reigning Prince of Monaco.

III. Prince Rainier reigned from 1949 to 2005. During this period, the Monaco coinage developed as follows: 1949-1960, during this period the Monaco franc was still based on gold. The mint mainly minted gold and silver coins, but smaller quantities of copper and nickel coins were also produced. In 1960, Monaco switched to the fiat monetary system. The mint then minted mainly copper and nickel coins, with smaller amounts of silver and gold coins also produced. In 1985, Monaco joined the European Monetary System. The mint then minted mainly copper and nickel coins, but also produced smaller amounts of silver and gold coins. III. During the reign of Prince Rainier, the Monaco mint minted many special issues, such as commemorative coins and money for official events.III. During the reign of Prince Rainier, the minting of Monaco underwent significant development. The mint is equipped with modern machines and has a wide range of products.