The story
The company started life in 1824 as the Liverpool and Belfast Steam Packet Company. operated by Langtry & Herdman. They began a steam ship service from Belfast to Liverpool.
Vessels introduced were as follows:
PS Chieftain, 1826
PS Corsair, 1827
PS Falcon, 1835
PS Reindeer, 1838
PS Sea-King, 1845
PS Blenheim, 1848
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About 1830 the Dublin Steam Packet Company began a weekly service in competition.
On 31 January 1852 the Liverpool and Belfast Steam Packet Company was registered as The Belfast Steamship Company Ltd.
In 1859, it expanded and absorbed the Cork Steamship Company and in 1866 it absorbed the Londonderry Steamboat Company.
It was absorbed into Coast Lines in 1919 as a subsidiary company, which was subsequently absorbed into P&O Ferries in 1975.
From Wikipedia’s article on Belfast Steamship Company, shared under CC BY-SA 4.0.3