The Dukedom of Connaught and Strathearn was named after one of the four provinces of Ireland, now known by its modern Irish language-based spelling of Connacht.

[2] Since the exit of the Irish Free State from the United Kingdom in 1922, titles related to locations in the Free State (and later the Republic of Ireland) have not been awarded (though Prince Edward, Prince of Wales—in 1936 briefly King Edward VIII—was made a Knight of the Order of St Patrick).

In the absence of any male heirs, the dukedom became extinct when Alastair died, 15 months after his grandfather.

Includes dukes of: Albany, Albemarle, Bedford, Cambridge, Clarence, Connaught and Strathearn, Cumberland, Edinburgh, Gloucester, Gloucester and Edinburgh, Hereford, Kent, Kintyre and Lorne, Norfolk, Ross, Somerset, Sussex, Windsor, and York, but only when royally.

While there were some speculations that it was one of the options available for Prince Harry upon his wedding with Meghan Markle, press reports have also noted that Connaught is now part of the Republic of Ireland, as well as the supposed manner in which the last Duke of Connaught and Strathearn died, thus making it unsuitable.