In 1593 he married Ursula Duke, daughter of Edward Duke of
Benhall,
Suffolk, who was the grandfather of
Sir Edward Duke, 1st Baronet, and his wife Dorothy Jermyn. Ursula died in April 1638. Ball quotes part of her
will as evidence of the wealth that 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, Clerk to the House of Commons. They had at least seven children: • Henry (c.1594-1632) a
barrister; as noted above, he drowned in the Amazon River while engaged in the early unsuccessful British attempt to
colonise Guiana. • Ambrose, dead by 1638. • Edward, dead by 1638. • John, died young. • Elizabeth (died 1647) married Charles Monck, Surveyor General of the Customs for Ireland and had issue. • Dorothy (died 1650), married Francis Sacheverell junior of
Richhill Castle,
Legacorry,
County Armagh, and had one daughter, Anne, who married Major Edward Richardson and had issue. • Anne, married Philip Ferneley, Clerk to the
Irish House of Commons, and had issue. Philip, who was a firm
Royalist and a protégé of
James Butler, 1st Duke of Ormonde, was first appointed in 1628, and was still serving as Clerk in 1665.
Statute 17 and 18 Charles II c.2 Since none of his sons had 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. ==References==