The Royal Mail Steam Packet Company was a British shipping company founded in London in 1839 by a Scot, James MacQueen. The line's motto was Per Mare Ubique. After a troubled start, it became the largest shipping group in the world in 1927 when it took over the White Star Line. The company was liquidated and its assets taken over by the newly formed Royal Mail Lines in 1932 after financial trouble and scandal; over the years RML declined to no more than the name of a service run by former rival Hamburg Süd.

Hamburg Südamerikanische Dampfschifffahrts-Gesellschaft A/S & Co KG, widely known as Hamburg Süd, was a German container shipping company. Founded in 1871, Hamburg Süd was among the market leaders in the North–South trade. It also served all significant East–West trade lanes.