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Earl Portarlington is in Earl Ireland.
In 1785 John Dawson 1st Earl Portarlington (age 40) was created 1st Earl Portarlington. Caroline Stuart Countess Portarlington (age 22) by marriage Countess Portarlington.
On 25th November 1798 John Dawson 1st Earl Portarlington (age 54) died. His son John (age 17) succeeded 2nd Earl Portarlington.
On 28th December 1845 John Dawson 2nd Earl Portarlington (age 64) died unmarried. His nephew Henry (age 23) succeeded 3rd Earl Portarlington.
On 3rd September 1847 Henry John Reuben Dawson-Damer 3rd Earl of Portarlington (age 24) and Alexandrina Octavia Maria Vane Countess Portarlington (age 24) were married. She by marriage Countess Portarlington. She the daughter of Charles William Vane 3rd Marquess Londonderry (age 69) and Frances Vane Tempest Marchioness Londonderry (age 47).
On 1st March 1889 Henry John Reuben Dawson-Damer 3rd Earl of Portarlington (age 66) died without issue. His first cousin Lionel (age 56) succeeded 4th Earl Portarlington. Harriet Lydia Robinson Montagu Countess Portarlington by marriage Countess Portarlington.