King Constantine I of Greece, full name Κωνσταντῖνος A', Βασιλεὺς τῶν Ἑλλήνων, reigned in Greece from 1913 to 1917 and again from 1920 to 1922. He was born on August 2, 1868 in Athens and died on January 11, 1923 in Palermo.I. He was the son of King George I. Constantine of Greece and Grand Duchess Olga Konstantinovna of Russia. He received military and scientific training and studied law and political science at the University of Leipzig. As heir to the throne, he participated in the organization of the 1896 Summer Olympic Games. he took part in the war, which was criticized for its unfortunate outcome. In 1909, after Elefthérios Venizélos came to power, he became popular again among the people, and in 1911 he was appointed inspector general of the army. At the outbreak of the first Balkan war, in 1912, again served as commander-in-chief.1913. ascended the throne on March 18, after being crowned king after the assassination of his predecessor, George I. During his first reign, Greece grew territorially as a result of the Balkan Wars. He abdicated in 1917, but returned in 1920 and reigned until 1922. His wife was Princess Zsófia of Prussia, and they had six children: György, Sándor, Ilona, Pál, Irén and Katalin.I. During the reign of Constantine, Greece underwent important changes, including territorial expansion and political instability, which had a significant impact on the development of the modern Greek state.

The reign of Constantine I fell during a turbulent period in Greek history, with two Balkan wars and the outbreak of the First World War. His coinage reflects these challenges and provides insight into the Greek economy and politics of the time.Coins: 1, 2, 5, 10 and 20 drachmas: These are the most common coins minted during Constantine's reign. They were made of bronze, silver and gold. In addition to the portrait of the king, they also featured the Greek coat of arms and the year. 50 drachma: Silver commemorative coin, which was minted to commemorate the victory in the Balkan Wars in 1913. 100 drachma: Gold commemorative coin, which was minted in honor of the 1916 Olympic Games in Athens. (The Olympic Games were eventually postponed due to World War I.) Paper money: 1, 5, 10, 25 and 50 drachmas: Banknotes issued by the National Bank of Greece. In addition to the portrait of the king, they also featured the Greek coat of arms and the value.