RMS Aquitania was a Cunard Line ocean liner that was built by the John Brown and Company shipyard near Clydebank, Scotland. She was launched on April 21, 1913, and sailed on her maiden voyage to New York in May 1914. The Aquitania was the third in Cunard Line's "grand trio" of express liners, preceded by the Mauretania and Lusitania of 1907. She was also the last of the four-stackers - like the RMS Titanic, and the Mauretania; however at the time, the Aquitania was considered the most beautiful of all four-stackers, earning her the nickname "Ship Beautiful".
The Aquitania had the longest career of any express liner in the 20th century. In her 36 years of service, the Aquitania survived military duty in both world wars and was returned to passenger service after each war.