The Cromwell family is an English aristocratic family descended from Hugh de Cromwell who came to England with William the Conqueror. Its most famous members are: Thomas Cromwell, 1st Earl of Essex; and, Oliver Cromwell, the Lord Protector. The line of Oliver Cromwell descends from Richard Williams (alias Cromwell), son of Thomas Cromwell's sister Katherine and her husband Morgan Williams.

Peerages and titles:

• John de Cromwell 1st Baron Cromwell (created 1308)

• Baron Cromwell of Wimbledon (created 1536, forfeited 1540)
• Earl of Essex (created 1540, forfeited 1540)
• Baron Cromwell (created 1540, extinct 1687)
• Viscount Lecale (created 1624, extinct 1687)
• Earl of Ardglass (created 1645, extinct 1687)
• Lord Protector of England, Scotland and Ireland
  • Oliver Cromwell (1599–1658)
  • Richard Cromwell (1658–1659)

Family tree of Walter Cromwell:

• Walter Cromwell (died ca. 1516/1521) m. Katherine Meverill
  • Katherine Cromwell (died bef. 12 July 1529) m. Morgan Williams (died bef. 12 July 1529)
    • Sir Richard Williams, alias Cromwell (ca. 1510 – 1544) m. Frances Murfyn (ca. 1520/1 – ca. 1543)
      • Sir Henry Williams, alias Cromwell (1537 – 1604) 1st m. Joan Warren (died 1584); 2nd m. Susan Weeks (died 1592)
        • (1) Sir Oliver Cromwell (ca. 1562 – 1655) 1st m. Elizabeth Bromley (died before 1601); 2nd m. Anne Hooftman (1565–1624)
          • (1) Elizabeth Cromwell (died 1666) 1st m. Henry Neale; 2nd m. Sir Richard Ingoldsby (died 1635)
          • (1) four sons and four daughters
          • (2) nine children
        • (1) Richard Cromwell
        • (1) Robert Cromwell (ca. 1560 – 1617) m. Elizabeth Steward (ca. 1564 - 1654)
          • Jane Cromwell m. John Desborough (1608-1680)
          • Catherine Cromwell (born 1597) 1st m. Roger Whitstone; 2nd m. John Jones (ca. 1597 - 1660)
          • Anne Cromwell m. John Sewster
          • Oliver Cromwell, Lord Protector (1599–1658) m. Elizabeth Bourchier (1598–1665)
            • Robert Cromwell (1621–1639)
            • Oliver Cromwell (1622–1644)
            • Bridget Cromwell (1624–1662) 1st m. Henry Ireton (1611–1651); 2nd m. Charles Fleetwood (ca. 1618 – 1692)
            • Richard Cromwell, Lord Protector (1626–1712) m. Dorothy Maijor (ca. 1620 – 1675)
              • Elizabeth Cromwell (1650–1731)
              • Edward Cromwell (1644–1688)
              • Anne Cromwell (1651–1652)
              • Mary Cromwell (born and died 1654)
              • Oliver Cromwell (1656–1705)
              • Dorothy Cromwell (1657–1658)
              • Anna Cromwell (1659–1727) m. Thomas Gibson
              • Dorothy Cromwell (1660–1681) m. John Mortimer
              • Edith Cromwell (1660–1694) m. N. N. Gist
            • Henry Cromwell (1628–1674) m. Elizabeth Russell (died 1687)
              • Henry Cromwell (died 1711) m. Hannah Hewling
              • five sons and two daughters
            • Elizabeth Cromwell (1629–1658) m. John Claypole (1625–1688)
            • James Cromwell (born and died in 1632)
            • Mary Cromwell (1637–1713) m. Thomas Belasyse, 1st Earl Fauconberg (ca. 1627 – 1700)
            • Frances Cromwell (1638–1720) 1st m. Robert Rich (died 1658) 2nd m. Sir John Russell, 3rd Baronet, of Chippenham (ca. 1632 – 1669)
        • (1) Dorothy Cromwell m. Thomas Fleming
        • (1) Joan Cromwell (died ca. 1641) m. Sir Francis Barrington, 1st Baronet, of Barrington Hall (ca. 1570 – 1628)
        • (1) Sir Philip Cromwell
        • (1) Henry Cromwell (c.1566–1630)
          • Elizabeth Cromwell (died before 1645) m. Sir Oliver St. John (ca. 1598 – 1673)
        • (1) Ralph Cromwell
        • (1) Mary Cromwell (died 1617) m. Sir William Dunch (died 1610/11)
        • (1) Elizabeth Cromwell (ca. 1562 – 1664) m. William Hampden (born 1570)
        • (1) Frances Cromwell m. Richard Whalley
      • Francis Williams, alias Cromwell (ca. 1541 – 1598) m. Margaret Mannock
        • Henry Williams, alias Cromwell (born 1565)
  • Thomas Cromwell, 1st Earl of Essex (ca. 1485 – 1540) m. Elizabeth Wyckes (died 1529)
    • Gregory Cromwell, 1st Baron Cromwell (ca. 1520 – 1551) m. Elizabeth Seymour (ca. 1518 – 1568)
      • Henry Cromwell, 2nd Baron Cromwell (1538–1592) m. Mary Paulet (ca. 1540 – 1592)
        • Edward Cromwell, 3rd Baron Cromwell (ca. 1559 – 1607) 1st m. Elizabeth Upton (died 1593); 2nd m. Frances Rugge (died 1631)
          • (1) Elizabeth Cromwell (born ca. 1585) 1st m. Sir John Shelton (1559 – 1606); 2nd m. Thomas Fitzhughes
          • (2) Thomas Cromwell, 1st Earl of Ardglass (1594–1653) m. Elizabeth Meverell (died 1651/53)
            • Lady Mary Cromwell (died 1676) m. William FitzHerbert (1624/29 – 1597)
            • Wingfield Cromwell, 2nd Earl of Ardglass (1624–1668) m. Mary Russell (before 1634 - after 1687)
              • Thomas Cromwell, 3rd Earl of Ardglass (1653–1682) 1st m. Honora Boyle (died 1710); 2nd m. Mary O'Brien (died 1727)
            • Vere Essex Cromwell, 4th Earl of Ardglass (1625–1687) m. Catherine Hamilton
              • Lady Elizabeth Cromwell (1676–1709) m. Edward Southwell (1671–1730)
            • Hon. Oliver Cromwell
          • (2) Frances Cromwell (1595–1662) m. Sir John Wingfield (ca. 1595 – 1631)
          • (2) Anne Cromwell (1597–1636) m. Sir Edward Wingfield (died 1638)
        • Sir Gregory Cromwell (born ca. 1561) m. Frances Griffin
        • Katherine Cromwell (died 1621) m. Sir Lionel Tollemache, 1st Baronet, of Helmingham
      • Edward Cromwell (1539 – before 1553)
      • Thomas Cromwell (ca. 1540 – 1610/11) m. Katherine Gardner (died 1615/16)
      • Katherine Cromwell (born ca. 1541) m. John Strode (1524 – 1581)
      • Frances Cromwell (ca. 1544 – 1562) m. Richard Strode (1528 – 1581)
    • Anne Cromwell (died ca. 1529)
    • Grace Cromwell (died ca. 1529)
    • (illegitimate daughter) Jane Cromwell (ca. 1530/35 – 1580) m. William Hough (ca. 1527 – 1585)

Wikimedia Commons has media related to Cromwell family.

• London Magazine: Or, Gentleman's Monthly Intelligencer, Volume 43 March 1774 page 130-135