John Blennerhassett (1691–1775)
Blennerhassett was born in County Kerry, the eldest son of John Blennerhassett and Margaret Crosbie. He served in the Kerry Militia and was a colonel by 1756. He was first elected as a Member of Parliament in 1709, taking his father's seat representing County Kerry. Between 1713 and 1715, he was MP for Tralee. He was again returned as the MP for Kerry in 1715, serving until 1727. Between 1727 and 1760, he served as the MP for Tralee, before serving as MP for Kerry for a third period between 1760 and his death in 1775.
He married Jane Denny, with whom he had two sons and four daughters.