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.