Caro I is a historical figure known for being the first king of Romania, reigning from 1866 until his death in 1914. He was born in 1839 in Germany and became a significant leader in the unification of the Romanian principalities of Wallachia and Moldavia. His reign marked the transition of Romania from a principality to a kingdom in 1881. During his rule, Caro I focused on modernizing Romania's infrastructure, economy, and military. He established a constitutional monarchy and promoted education and cultural development. His efforts laid the groundwork for Romania's growth and integration into European affairs during the early 20th century.