The Imperator-class ocean liners were a series of three ocean liners designed for the Hamburg America Line, which included the RMS Majestic, originally launched in 1914 as the SS what?
Imperator-class ocean liner:  Namely the "Imperator" (1912), the "Vaterland" (1913) and the largest, the "Bismarck" (1914).
i don't know