- 15 July 1843
Charles William Cayzer born
- 1856
Union Steam Ship Company formed
- 1861
Charles William Cayzer employed by William Nicol & Co. in Bombay
- 1862
Donald Currie & Company formed
- 1874
Charles William Cayzer leaves Nicol & Co and briefly moves to Cardiff
- 21 January 1876
August Bernard Tellefsen Cayzer born
- 1877
Charles William Cayzer moves to Liverpool where he begins trading as Charles Cayzer & Co
- 1878
Charles William Cayzer establishes Cayzer Irvine & Co in Liverpool, having made business contacts in Glasgow
- 1878
Clan Alpine, Charles William Cayzer's first steamship, built in Glasgow
- 23 July 1881
Herbert Robin Cayzer born
- 1881
Clan Line Association Steamers formed, managed by Cayzer Irvine & Co, and 109 Hope Street, Glasgow becomes company headquarters
- 1881
Castle Packet Company becomes Castle Mail Packet Company
- 1890
Clan Line Steamers Limited is formed
- 1892 - 1896
Charles William Cayzer becomes Member of Parliament (Conservative) for Barrow-in-Furness
- 1897
Charles William Cayzer knighted
- 1900
Union Steam Ship Company and Castle Mail Packet Company amalgamate to become the Union-Castle Steamship Company
- 12 December 1904
Charles William Cayzer created 1st Baronet of Gartmore
- 28 April 1904
August Bernard Tellefsen Cayzer marries Ina Frances Stancomb
- 1907
Cayzer Irvine & Co becomes a limited company
- 1908 - 1909
Sir Charles William Cayzer fails in his attempt to be elected MP for Monmouth Boroughs
- 21 January 1910
(William) Nicholas Cayzer born.
- 1912
Union-Castle Line taken over by Royal Mail Steam Packet Company
- 1914
Britain enters the First World War. Six Cayzer family members and company directors are called to active service.
- 28 September 1916
Sir Charles William Cayzer 1st Bart., dies
- October 1916
August Cayzer becomes chairman of Cayzer, Irvine & Co. He appoints his brother Herbert Cayzer as deputy chairman, with an identical salary to his own.
- 1918
Assets of the Scottish Shire Line acquired, adding refrigeration capacity to the fleets.
- 1918
August Cayzer is instrumental in the purchase of the Greenock Dockyard Company, putting Cayzer Irvine & Co in the unique position, for a shipping line, of possessing its own shipyard. The company headquarters move to No. 2 St Mary Axe in the City of London
- 1918
August Cayzer begins to rebuild the firm by acquiring the British & South American Steam Navigation Company.
- 1921
August Bernard Tellefsen Cayzer is created 1st Baronet of Roffey Park in recognition of his and the Clan Line's services to the war effort.
- 1922
Sir Charles Cayzer, 3rd Bart., wins the parliamentary constituency of Chester for the Conservatives and remains their M.P. for 20 years.
- January 1924
Herbert Robin Cayzer is created 1st Baronet of Tylney in the New Year's Honours list
- 1926
Clan Line's capital is reduced from almost £4 million to under £2 million. It is forced to sell the British & South American Steam Navigation Company to the Royal Mail Group
- 1929
The crash of the New York Stock Exchange brings dire consequences for world economics and trade. The Great Depression begins.
- 1933Fred Bedford the Managing Director of Cayzer, Irvine & Co., is forced to introduce a 10% salary cut across the firm as a result of the worldwide economic depression.
- 1936
Union-Castle Line becomes independent again
- 1939
Both the Clan Line, its associated Greenock Dockyard, and Union-Castle are much affected by wartime requisitioning.
- 8th June, 1939
Sir Herbert Cayzer created 1st Baron Rotherwick of Tylney in the King's Birthday Honours
- 28 February 1943
Sir August Cayzer dies. Lord Rotherwick becomes the chairman of the family business
- 1945
By the end of the war Clan Line have lost 37 ships and Union-Castle 11 through enemy action.
- 1946
Clan Line buys eight freighters, limited shipyard capacity and high building prices preventing the construction of new ships.
- 1947
Union-Castle negotiates new mail and freight contracts with the South African government.
- 1947
Mrs Smuts launches the Pretoria Castle in Belfast by radio from South Africa.
- 15 October 1953
Clan Line take over Hunting Group's air transport and servicing business. Hunting-Clan Air Transport is formed.
- 1955
Hunting-Clan Air Transport begin a weekly 'Africargo' service.
- 1956
Clan Line group merges with the Union-Castle Line group to form the British & Commonwealth Shipping Company Limited.
- 1957
Hunting-Clan begins to offer passenger flights and package holidays.
- 17 March 1958
Lord Rotherwick dies. Sir Nicholas Cayzer 2nd Bart., (of Roffey Park) becomes Chairman of British & Commonwealth
- 1959
British & Commonwealth purchase Springbok Shipping Company.
- 1960
Hunting-Clan merges with Airwork to form British United Airways.
- 1962
British & Commonwealth purchases Hector Whaling Company.
- 1964
The decision is made that the Clan Alpine will be the last ship built for Clan Line.
- 1965
Air Holding Limited is formed, bringing together major shipping companies with an interest in air freight including British & Commonwealth
- 1966
British & Commonwealth take a 36 per cent interest in the South African Marine Corporation [Safmarine]
- 1970
British United Airways is bought by Caledonian Airlines. It becomes British Caledonia.
- 1 January 1982
Sir Nicholas Cayzer is created Baron Cayzer of St Mary Axe in the City of London in the New Year's Honours.
- 1987
Caledonia Investments separates from British & Commonwealth