Colonel Sir Rowland Blennerhassett, 1st Baronet was an Anglo-Irish lawyer and baronet.
Blennerhassett was the son of Robert Blennerhassett and Frances Yielding. He was the great-grandson of Robert Blennerhassett Member of Parliament.
He trained as an attorney and practised law. He was the colonel of the "Laune Rangers" militia regiment of volunteers from 1779 to 1782. Between 1796 and 1797 he was a Justice of the Peace in County Kerry.
Blennerhassett resettled his family at Cahirmoreaun, just outside Tralee, renaming both the house and the village Blennerville in his family"s honour.
He built a large new family home at Churchtown House, Knockane. In 1800 he was granted permission to hold four fairs a year and one market a week in Blennerville, which providing him with extra income.
On 22 September 1809 he was created a baronet of Blennerville in the County of Kerry, in the Baronetage of the United Kingdom. He was confirmed the right to bear the family coat of arms a year earlier.
Millicent was killed in an accident in 1801.
Together, they had five children:
Sir Robert Blennerhassett, 2nd Baronet (26 January 1769 - 21 September 1831), married Rosanna Blennerhassett
Richard Francis Blennerhassett (23 May 1772 - November 1827), married Agnes Denny, daughter of Sir Barry Denny, 1st Baronet
Arthur Blennerhassett (27 October 1776 - 31 May 1839), married Honorary Helena Jane Mullins, daughter of Thomas Mullins, 1st Baron Ventry
Rowland Blennerhassett (26 December 1780 - 12 April 1854), married Letitia Hurly
William Blennerhassett (26 December 1780 - 1842), married Elizabeth Blennerhassett.