- Born on September 15, 1744
- Deceased on November 15, 1806, at the age of 62 years
Parents
- William Ponsonby (1704 - 1793), Earl of Bessborough, Member of Parliament for Newtownards, Member of Parliament for County Kilkenny
- Caroline Cavendish (1719 - 1760)
Family
- Married with Louisa Molesworth (1749 - 1824), issuing
- William (1772 - 1815)
- Mary Elizabeth (1776 - 1861)
Occupations
- postmaster general General of Ireland (1784 - 1789)
- Member of Parliament for Cork City (1764 - 1776)
- Member of Parliament for Bandonbridge (1776 - 1783)
- Member of Parliament for Newtownards (1783)
- Member of Parliament for County Kilkenny (1783 - 1801, 1801 - 1806)
- privy counsellor of Ireland