William I, German Emperor was born on March 22, 1797, and became the first Emperor of Germany in 1871. He was a key figure in the unification of Germany, which was achieved through a series of wars and diplomatic efforts led by Otto von Bismarck. William I was the King of Prussia from 1861 until his death in 1888. His reign as Emperor lasted from 1871 until his death, during which he focused on strengthening the German Empire and its military. William I was known for his conservative policies and support of the monarchy, which helped shape the political landscape of Germany in the late 19th century.