Carol I of Romania

Carol of Hohenzollern-Sigmaringen was elected Prince of Romania on April 20, 1866, following the abdication of Alexandru Ioan Cuza. He arrived in Romania in May and was sworn in, beginning the Hohenzollern dynasty's rule over the country.

Carol I initiated the construction of Romania's first major railway line, connecting Bucharest to Giurgiu. This project expanded into a national network, modernizing transportation and facilitating economic development.

Carol I led Romanian forces alongside the Russian army against the Ottoman Empire in the Russo-Turkish War. The Romanian army played a key role in the Siege of Plevna, and the war resulted in Romania's full independence from Ottoman suzerainty.

Carol I's diplomats secured international recognition of Romania's independence at the Congress of Berlin. The treaty also forced Romania to cede southern Bessarabia to Russia in exchange for the Dobruja region, a controversial territorial swap.

On March 26, 1881, Romania was proclaimed a kingdom, and Carol I was crowned as its first king. This elevated Romania's international status and solidified its independence from the Ottoman Empire, which had been recognized in 1878.