Who were william I and otto von bismarck

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Otto Eduard Leopold, Prince of Bismarck, Duke of Lauenburg, known as Otto von Bismarck, was a conservative German statesman who masterminded the unification of Germany in 1871 and served as its first chancellor until 1890, in which capacity he dominated European affairs for two decades.

William I, usually known as William the Conqueror, was the first Norman King of England, reigning from 1066 until his death in 1087. He was a descendant of Rollo and was Duke of Normandy from 1035 onward.