King George I of Greece was born on December 24, 1845, in Denmark. He became the King of Greece in 1863 after the Greek War of Independence and the subsequent establishment of the modern Greek state. His reign lasted until his assassination in 1913, making him one of the longest-serving monarchs in Greek history. During his time on the throne, King George I worked to modernize Greece and strengthen its economy. He also played a significant role in expanding Greek territory through various conflicts, including the Balkan Wars. His legacy includes the establishment of a constitutional monarchy in Greece.