Frederick I King of Prussia was born July 11, 1657 in Konigsberg, Prussia. He married Elizabeth Henrietta of Hesse-Cassel on August 23, 1679 in Potsdam. He married Sophia Charlotte, daughter of Ernest Augustus of Brunswick Duke and Sophia, on October 8, 1684 in Herrenhausen. He married Sophia Louise of Mecklenburg- on November 28, 1708 in Berlin. He died on February 25, 1712/13 in Berlin, Germany, at age 55.