The reign of Ferdinand I (1914-1927) fell on an extremely turbulent period in Romania's history, full of war, territorial changes and economic challenges. The coinage in this period reflects the events of the era and provides insight into the changes in the Romanian economy and society. At the outbreak of the First World War, Romania was not yet ready for modern warfare. The army was poorly equipped and most of the weaponry was imported. This situation also affected the coinage. In 1914, the Romanian mint minted gold and silver coins, but due to the economic difficulties caused by the war, the gold and silver coinage was stopped in 1916. From 1917, the mint printed paper money to cover the war expenses. Paper money inflation rose rapidly, leading to economic instability. After World War I, Romania acquired significant territories, including Transylvania, Bukovina, and Bessarabia. This increase in territory brought with it a boom in the Romanian economy. In 1922, the leu was introduced as Romania's new national currency. The lei was initially pegged to gold, which provided stability to the economy. In the 1920s, the Romanian mint minted gold and silver coins again, but their quantity was significantly smaller than in the pre-war period. Coins and banknotes in circulation: gold coins: 20 lei (1914), 100 lei (1914), silver coins: 1 lei (1914), 5 lei (1914). Paper money: 1 lei (1917), 5 lei (1917), 10 lei (1917), 50 lei (1917) , 100 lei (1917).I. During the reign of Ferdinand, the Romanian coinage reflected the historical and economic events of the era. The difficulties caused by the war resulted in a decline in coinage, while the recovery after the war led to the introduction of the lei and the stabilization of the economy.