Arms: Per pale Argent and Sable, a Chevron and in base a Crescent all counterchanged, on a Canton Azure, a Harp Or, stringed Argent. Crest: An Arm in Armour embowed proper, holding a Sword proper, pommel and hilt Or. Supporters: Dexter: A Mermaid holding in the exterior hand a Mirror, all proper; Sinister: An Elephant Argent.
He was succeeded by his son, the second Earl. He was the first Governor of the Cape Colony and sat in the House of Lords as an Irish representative peer from 1804 to 1839. His son, the third Earl, briefly represented County Tyrone in the House of Commons as a Tory and was an Irish Representative Peer between 1841 and 1855. His eldest son, the fourth Earl,[6][7] sat in the House of Lords as an Irish Representative Peer from 1877 to 1898. He was succeeded by his eldest son, the fifth Earl. He never married and was succeeded by his nephew, the 6th Earl. He was the son of the Hon. Herbrand Charles Alexander, second son of the fourth Earl. Today the titles are held by his only son, the seventh Earl, who succeeded in 1980.[8][unreliable source?] Lord Caledon was made Lord Lieutenant of County Armagh in 1989.
The family's lineage can be traced to Captain Andrew Alexander, of Errigal, County Donegal, who was granted lands at Ballyclose near Limavady, County Londonderry, in 1663 and was later attainted by the parliament called by James II in Dublin in 1689. He had a son, Jacob Alexander, who was the ancestor of the Alexanders of Ahilly (Donegal), by his first wife, a Miss Phillips, who was a relative of the Alexanders, and by his second wife, Miss Hillhouse, he had a son, John Alexander, who married Anne White, daughter of John White, of Cadyhill, County Londonderry, and had four children. His second son Nathaniel Alexander was born in 1689 and became an Alderman of the city of Derry in 1755 and died on 22 September 1761, having had with other children a third son, James Alexander, who became the 1st Earl of Caledon.[9]
The style Viscount Alexander is used as a courtesy title for the Earl's eldest son and heir apparent.