RMS Adriatic was a British ocean liner of the White Star Line. She was the fourth of a quartet of ships of more than 20,000 GRT, dubbed The Big Four. The ship was the only one of the four which was never the world's largest ship. However, she was the largest, the fastest, and the most luxurious of the Big Four, being the first ocean liner to have an indoor swimming pool and Victorian-style Turkish baths.

RMS Oceanic was a transatlantic ocean liner built for the White Star Line. She sailed on her maiden voyage on 6 September 1899 and was the largest ship in the world until 1901. At the outbreak of World War I she was converted to an armed merchant cruiser. On 8 August 1914 she was commissioned into Royal Navy service.