SS Imperator was a German ocean liner built for the Hamburg America Line (Hamburg Amerikanische Paketfahrt Aktien Gesellschaft, or HAPAG), launched in 1912. At the time of her completion in June 1913, she was the largest passenger ship in the world by gross tonnage, surpassing the new White Star giants, Olympic and Titanic.
Imperator was the first of a trio of successively larger Hamburg American liners that included SS Vaterland (later the United States Liner Leviathan) and SS Bismarck (purchased and renamed Majestic for the White Star Line transatlantic passenger service).
During World War I, the ship remained in port in Hamburg.
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