Louis I (full name: Luís Filipe Maria Fernando Pedro de Alcântara António Miguel Rafael Gabriel Gonzaga Xavier Francisco de Assis João Augusto Júlio Valfando de Saxe-Coburgo-Gotha e Bragança) was the king of Portugal. 1838. was born on October 31 in Lisbon as Prince Ferdinand of Szasz-Coburg-Koháry and II. Maria's second child. After his brother Péter V died, he ascended the throne on November 11, 1861. King Louis, like his brother, unsuccessfully tried to take action against the party battles taking place in the country. The country experienced continuous changes of government. During Mello's administration, he reorganized the army, built railways, expanded suffrage, and created a new civil and criminal code. Although he was unable to alleviate the country's financial problems, his popularity grew. He also paid attention to the affairs of the colonies and concluded treaties with the Germans, the French and the Congo state, which definitively defined the borders of the Portuguese colonies. In 1862, he married the Italian royal princess Maria Pia of Savoy (1847–1911), who bore him two sons: Prince Charles (1863–1908), later King of Portugal as Charles I. Prince Alfonz (1865–1920).I. Lajos died on October 19, 1889 in Cascais and is buried in the Monastery of São Vicente de Fora.

King Louis I of Portugal reigned from 1861 to 1889. During this period, he implemented the following changes in Portuguese coinage: He introduced a new series of coins. Instead of the old series of coins introduced in 1837, he produced a new series with a more modern design, on which his portrait appeared. He introduced new types of coins. In the earlier period, only gold and silver coins were minted in Portugal, but King Louis also introduced copper coins of 1, 5, 10 and 20 centavos. He used new coin materials. In addition to gold and silver coins, he also minted coins made of copper and nickel alloys. The series of coins introduced by King Louis looked as follows: gold: 1000, 500, 250, 100, 50 and 25 reais, silver: 20, 10, 5 and 2.5 escudos, copper: 1, 5, 10 and 20 centavos. Regarding the amount of coinage, there was a significant increase during the reign of King Louis. This growth was due to economic development and increased trade. The coinage of King Louis had a significant impact on Portuguese finances. The new coin series was more modern and easier to recognize than the previous series. And the new types of coins contributed to the modernization of the economy.