[1] The first Earl was made Viscount Boyle, of Bandon, and Baron Castle Martyr at the same time, also in the Peerage of Ireland.

This title gave him and the later Earls an automatic seat in the British House of Lords.

On his death the titles passed to his son, the fourth Earl, who briefly represented County Cork in the House of Commons.

The Honourable Sir Algernon Boyle, sixth son of the fifth Earl, was an admiral in the Royal Navy.

[6] As of 2023, Shannon is unmarried, and the heir presumptive is his second cousin once removed, Robert Francis Boyle (born 1930),[7] a grandson of a younger son of the 5th Earl.