William O'Brien, 2nd Marquess of Thomond

Irish Marquess (1765–1846)

Parents

• Mary Carrick
• Edward Dominic O'Brien

Children

• Lady Susan Maria O'Brien
• Lady Mary O'Brien
• Lady Elisabeth O'Brien
• Lady Sarah O'Brien

Siblings

• James O'Brien, 3rd Marquess of Thomond
• Murrough O'Brien
• Mary O'Brien
• Harriet O'Brien
• John O'Brien
• Lord Edward O'Brien

Partners

• Elizabeth Trotter