15th Regiment of Foot

Known as The East Yorkshire Regiment

Chronology

1685 raised as Clifton's Regiment of Foot
1751 became the 15th Regiment of Foot
1782 became the 15th (The Yorkshire East Riding) Regiment of Foot
1881 became the East Yorkshire Regiment
1935 became the East Yorkshire Regiment (The Duke of York's Own)
1958 amalgamated with The West Yorkshire Regiment (14th Foot) to form The Prince of Wales's Own Regiment of Yorkshire (14th/15th Foot)
2006 amalgamated, with two other Yorkshire regiments becoming the 1st Battalion, The Yorkshire Regiment (Prince of Wales's Own)

East Yorkshire Regiment Wikipedia
Prince of Wales's Own Regiment of Yorkshire Wikipedia
Yorkshire Regiment Wikipedia
Yorkshire Regiment Family Tree www.army.mod.uk, now an archived webpage
The East Yorkshire Regiment (The Duke of York's Own) including deployments: 1st Battalion, 2nd Battalion Regiments.org, an archived site
Now an archived website: The Prince of Wales’s Own Regiment of Yorkshire (PWO) Museum Archived website including
- The East Yorkshire Regiment (15th Regiment of Foot)
- Historical Research. Replaced by
York Army Museum The regimental museum of The Royal Dragoon Guards and The Yorkshire Regiment. The Museum holds the collection of Prince of Wales’s Own Regiment of Yorkshire for the Yorkshire Regiment, being the 14th and 15th Regiment of Foot, and the regimental collections for all of The Royal Dragoon Guards’ antecedents, being 4th, 5th and 7th Dragoon Guards and the 6th Dragoons.

Historical Record of the Fifteenth, or The Yorkshire East Riding Regiment of Foot: containing an account of the formation of the regiment in 1685, and of its subsequent services to 1848 by Richard Cannon 1848 Google Books. Page 80 states the Regiment arrived in Ceylon in 1846.
The Memoirs of the Gemini Generals; Personal Anecdotes, Sporting Adventures, and Sketches of Distinguished Officers by Major-Generals Osborn Wilkinson and Johnson Wilkinson. 1896 Archive.org. Twin brothers Osborn and Johnson Wilkinson were born 1822. The former joined the Bengal Cavalry, and served in the 2nd Bengal Cavalry and 10th Light Bengal Cavalry, the latter HM 15th Regiment of Foot, which went to Ceylon in 1845, with a period at Poona.
98° versus 130°, or, the Infantry Soldier in the Tropics by ‪Jones Lamprey Assistant Surgeon, H M’s 15th Regiment. 1852 Google Books. [Remarks on the dress worn by the army in Ceylon].