1st Regiment of Foot

Also known as The Royal Regiment and The Royal Scots

Chronology

1625 raised as John Hepburn's Regiment
1633 became the Royal Regiment of Foot
1684 became His Majesty's Royal Regiment of Foot also known until 1751 by the names of colonels
1751 became the 1st (Royal) Regiment of Foot
1812 became the 1st Regiment of Foot (Royal Scots)
1821 became the 1st or The Royal Regiment of Foot
1881 became The Royal Scots (Lothian Regiment)
1921 became The Royal Scots (The Royal Regiment)
2006 amalgamated with The Royal Highland Fusiliers, The King's Own Scottish Borderers, The Black Watch, The Highlanders (Seaforth, Gordons and Camerons), and The Argyll and Sutherland Highlanders, to form The Royal Regiment of Scotland

Historical record of the First, or Royal Regiment of Foot: containing an account of the origin of the regiment in the reign of King James VI of Scotland, and of its subsequent services to 1838 1838 Google Books . East Indies Service commences page 175 when the Second Battalion arrives on Prince of Wales Island (Penang) in 1807
"The Royal Scots (Lothian Regiment)" from The Lowland Scots Regiments : their origin, character and services previous to the great war of 1914 edited by Sir Herbert Maxwell 1918 Archive.org