Earl Howth is in Earl Ireland.
On 3rd September 1767 Thomas St Lawrence 1st Earl Howth [aged 37] was created 1st Earl Howth, 1st Viscount St Lawrence.
In 1773 Thomas St Lawrence 1st Earl Howth [aged 42] and Isabella King Countess Howth were married. Isabella King Countess Howth by marriage Countess Howth.
On 29th September 1801 Thomas St Lawrence 1st Earl Howth [aged 71] died. His succeeded son William St Lawrence 2nd Earl Howth [aged 48] succeeded 2nd Earl Howth, 2nd Viscount St Lawrence, 16th Baron Howth.
In or before 1803 William St Lawrence 2nd Earl Howth [aged 50] and Margaret Burke Countess Howth were married. She by marriage Countess Howth. He the son of Thomas St Lawrence 1st Earl Howth and Isabella King Countess Howth.
On 4th April 1822 William St Lawrence 2nd Earl Howth [aged 69] died. His succeeded son Thomas St Lawrence 3rd Earl Howth [aged 18] succeeded 3rd Earl Howth, 3rd Viscount St Lawrence, 17th Baron Howth.
On 9th January 1826 Thomas St Lawrence 3rd Earl Howth [aged 22] and Emily Burgh Countess Howth were married. Emily Burgh Countess Howth by marriage Countess Howth. She the daughter of John Thomas Burgh 13th Earl Clanricarde. He the son of William St Lawrence 2nd Earl Howth and Margaret Burke Countess Howth.
On 27th February 1851 Thomas St Lawrence 3rd Earl Howth [aged 47] and Henrietta Barfoot Countess Howth were married. She by marriage Countess Howth. He the son of William St Lawrence 2nd Earl Howth and Margaret Burke Countess Howth.