Earl of Ardglass
The title Earl of Ardglass was created in the Peerage of Ireland on 15 April 1645. The Earl held the subsidiary titles of Baron Cromwell and Viscount Lecale. All three titles became extinct in 1687.- Gregory Cromwell, 1st Baron Cromwell
- Henry Cromwell, 2nd Baron Cromwell
- Edward Cromwell, 3rd Baron Cromwell
- Thomas Cromwell, 4th Baron Cromwell
Earls of Ardglass (1645)
- Thomas Cromwell, 1st Earl of Ardglass
- Wingfield Cromwell, 2nd Earl of Ardglass
- Thomas Cromwell, 3rd Earl of Ardglass
- Vere Essex Cromwell, 4th Earl of Ardglass
