Earl of Ulster

The title of Earl of Ulster has been created several times in the Peerage of Ireland and Peerage of the United Kingdom. Currently, the title is a subsidiary title of the Duke of Gloucester, and is used as a courtesy title by the Duke's son, Alexander Windsor, Earl of Ulster. Ulster is one of the four traditional provinces of Ireland.

Earls of Ulster, Peerage of Ireland, First Creation (1205)

• Hugh de Lacy, 1st Earl of Ulster (1176–1243)

Earls of Ulster, Peerage of Ireland, Second Creation (1264)

• Walter de Burgh, 1st Earl of Ulster (d.1271)
• Richard Óg de Burgh, 2nd Earl of Ulster (1259–1326)
• William Donn de Burgh, 3rd Earl of Ulster (1312–1333)
• Elizabeth de Burgh, Duchess of Clarence, 4th Countess of Ulster (d.1363)
  • m. Lionel of Antwerp, 1st Duke of Clarence, jure uxoris Earl of Ulster (1338–1368)
• Philippa, Countess of March, 5th Countess of Ulster, (1355–1382)
  • m. Edmund Mortimer, 3rd Earl of March, jure uxoris Earl of Ulster (1352–1381)
• Roger Mortimer, 4th Earl of March and 6th Earl of Ulster (1374–1398)
• Edmund Mortimer, 5th Earl of March and 7th Earl of Ulster (1391–1425)
• Richard of York, 3rd Duke of York, 8th Earl of Ulster (1412–1460)
• Edward of York, 4th Duke of York, 9th Earl of Ulster (1442–1483), merged in crown 1461

Earls of Ulster, Peerage of Ireland, Third Creation (1659)

• James Stuart, Duke of York and Albany (1633–1701), merged in crown 1685

Earls of Ulster, Peerage of Ireland, Fourth Creation (1716)

• Ernest Augustus of Brunswick-Lüneburg, Duke of York and Albany (1674–1728)

Earls of Ulster, Peerage of Ireland, Fifth Creation (1760)

• Prince Edward, Duke of York and Albany (1739–1767)

Earls of Ulster, Peerage of Ireland, Sixth Creation (1784)

• Prince Frederick, Duke of York and Albany (1763–1827)

Earls of Ulster, Peerage of the United Kingdom, First Creation (1866)

• Prince Alfred, Duke of Edinburgh (1844–1900)

Earls of Ulster, Peerage of the United Kingdom, Second Creation (1928)

• Prince Henry, Duke of Gloucester (1900–1974)
• Prince Richard, Duke of Gloucester (b. 1944)
  • Alexander Windsor (b. 1974), Prince Richard's eldest son, is the heir-apparent to the dukedom, and, as such, uses "Earl of Ulster" as a courtesy title.