Question: 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?
Sentence (from "Kaiser-class ocean liner"): These four ships, two of whom held the prestigious Blue Riband, were known as the "four flyers" and all proved to be popular with wealthy transatlantic travellers.
Relevant evidence: No