He was born at Pockthorpe, near Lyng, Norfolk, a younger son of William Blennerhassett; from his presumed date of birth he must have been the child of William's second marriage to Alice Sylsby. His father, who also held lands at Horsford, was a substantial landowner and magistrate, noted for his "Godly zeal" and staunchly Puritan views. John's brothers Edward and Thomas played a key part in the Plantation of Ulster and were granted large estates in Fermanagh. Robert Blennerhassett, the founder of the Blennerhassett family of Ballyseedy, County Kerry, was a cousin of the judge, as was the elder John Blennerhassett, who was Member of Parliament for Norwich in 1563 and 1571.
Career
He studied law at Furnivall's Inn, then entered Lincoln's Inn in 1583, and was called to the Bar in 1591. In 1609 he became a Bencher of Lincoln's Inn and in the same year he was sent to Ireland as an extra Baron of the Court of Exchequer, due to the "infirmity" of the existing Barons; he ranked in seniority directly after the Chief Baron. He became a member of the King's Inn and became Treasurer in 1611, and had his own chamber in the Inn. He was knighted by James I at Hampton Court in 1609. He had a reputation for being a "good servant of the Crown" and sat as MP for Belfast in the only Irish Parliament of the reign in 1613-15. He was a Commissioner for the Plantation of Wexford. He enjoyed the patronage of the powerful Munster magnate Richard Boyle, 1st Earl of Cork, and arranged the marriage of Lord Cork's seven-year-old daughter Sarah to Thomas Moore, son of Garret Moore, 1st Viscount Moore. Elrington Ball attributes his promotion to the office of Chief Baron in 1621 to his powerful political connections. He was praised by the Privy Council of Ireland as "an ancient counsellor.... thought by the Lord Chancellor of Ireland and others to be fit for ". Ball admits that he was a conscientious judge of assize, going mainly on the north-eastern circuit.
Death and burial
Blennerhassett died on 14 November 1624 and was buried "within the choir" of St. Patrick's Cathedral, Dublin. His wife died in 1638 and was buried beside him. The inscription which was added to the tomb after her burial records that several of their children had died in the meantime, including Henry, their eldest son, who was a member of the British Guiana Company, in which capacity he settled in South America and drowned in the Amazon River in 1632.
Wife and children
In 1593 he married Ursula Duke, daughter of Edward Duke of Benhall, Suffolk, who was the grandfather of Sir Edward Duke, 1st Baronet. She died in April 1638. Ball quotes part of her will as evidence of the wealth which the Blennerhassett family had acquired, and also of the pomp and circumstance in which a senior judge and his wife were then expected to live: Lady Blennerhassett bequeathed to her heirs a carriage and horses, much silver plate, several beds, a cabinet, diamonds, pearls, and satin and velvet gowns. She also possessed some real property which she left to her daughter Anne's husband, Philip Ferneley. They had at least seven children:
Henry a barrister; as noted above he drowned in the Amazon river while engaged in the settlement of British Guiana
Ambrose, dead by 1638
Edward, dead by 1638
John, died young
Elizabeth,, married Charles Monck, Surveyor General of the Customs for Ireland
Dorothy,, married Francis Sacheverell
Anne, married Philip Ferneley, Clerk to the Irish House of Commons.
Since none of his sons left children, their father's estates were divided between their sisters' heirs. Henry left most of his personal property to his sister Elizabeth. Her descendants included Charles Monck, 1st Viscount Monck.
