20th Regiment of Foot - Lancashire Fusiliers

20th November 1688
Sir Richard Peyton's Regiment of Foot.
The regiment was raised in Devonshire. Until 1751 it was also known by the names of ten other colonels.
1st July 1751
20th Regiment of Foot
31st August 1782
20th (The East Devonshire) Regiment of Foot.
1st July 1881
The Lancashire Fusiliers
23rd April 1968
Merged with The Royal Northumberland Fusiliers, The Royal Warwickshire Fusiliers and The Royal Fusiliers (City of London Regiment) to form The Royal Regiment of Fusiliers.

The image on this post shows Archibald Arnott M.D. (1771-1855). Surgeon to the 20th Regiment of Foot. I've borrowed this image from John Tyrell's excellent, Reflections on A Journey to St Helena.

7th Regiment of Foot - Royal Fusiliers

11th June 1685
The Ordnance Regiment. Raised in the City of London from two companies of Tower Guards as an escort to the train of Artillery. Also known as the Royal Regiment of Fusiliers.
1747
Royal English Fuzileers. Ranked as the 7th Regiment of Foot
1st July 1751
7th Regiment of Foot (Royal Fuzileers)
1st July 1881
The Royal Fusiliers (City of London Regiment). Two regular battalions. Designated as the city regiment of London, also encompassing militia and volunteer infantry.
1889
County of London formed from parts of Kent, Middlesex and Surrey
1898
3rd (Regular) Battalion formed.
1900
4th (Regular) Battalion formed
1st April 1908
The 1st, 2nd, 3rd and 4th Volunteer Battalions were transferred to the London Regiment and became the 1st, 2nd, 3rd and 4th (City of London Battalions), The London Regiment, upon the creation of the Territorial Force.
7th July 1916
The four Territorial Force battalions mentioned above were re-affiliated to The Royal Fusiliers
1922
The 3rd (Regular) and 4th (Regular) Battalions are disbanded.
23rd April 1968
Amalgamated with the Royal Northumberland Fusiliers, The Royal Warwickshire Fusiliers and the Lancashire Fusiliers to form The Royal Regiment of Fusiliers