The title Earl of Ardglass (pronounced "Ar-glass") was created in the Peerage of Ireland on 15 April 1645. The Earl held the subsidiary titles of Baron Cromwell (Peerage of England, 18 December 1540) and Viscount Lecale (Peerage of Ireland, 22 November 1624). All three titles became extinct in 1687.

Barons Cromwell (1540)

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Earls of Ardglass (1645)

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References

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