Henry Bayntun was born in 1572 at Bromham House in the county of Wiltshire and was 21 years old when his father, Sir Edward Bayntun, died and subsequently inherited the Manor of Bromham.

He was M.P. for Devizes Borough in 1585 and 1592 and again in 1603, M.P. For Wiltshire County in 1597 and High Sheriff of Wiltshire in 1600. On 14th September 1601 he was awarded the title Knight Bachelor.

He was a man of conscience and he exercised great influence around Bromham, Stanley, Chippenham and Bremhill, where he had another substantial house. The Court Book of the Bayntuns for various manors, including Bromham, for the years 1565 to 1612 is in the British Museum.

In 1595, Henry sold an estate in Berwick Bassett, which was the origin of Berwick Farm, to Thomas Hutchins. The estate was acquired by his grandfather, Sir Edward Bayntun at the time of the Dissolution in 1541, along with the Manor of Temple Rockley.

He was married to Lucy Danvers, the daughter of Sir John Danvers, of Bromham, Wiltshire and sister of Henry Danvers, the Earl of Danby. They had three children, Edward (born 1593), Charles (born 1594, but died the following year, aged just 13 months) and Elizabeth (born 1596).

In 1606 Sir Henry and his servants appeared in the Star Chamber accused of taking deer and timber, removing boundaries and illegally enclosing a park in Pewsham and Blackmore Forests. They were prosecuted for this offence.

A survey taken in 1612, listed a large tenantry on manors owned by Sir Henry.

In March 1616 King James granted Sir Henry his reversion to the entailed manors, etc. of Bromham and parcel of the lands of Battle Abbey, Sussex.

The family owned many manors at this time, including that of Bremhill, Wiltshire. A survey of the Bromham and Bremhill manors, taken for Sir Henry and dated 1611, shows a large manor house at Bremhill. At times the family chose to live there and some of the children were baptised at St. Martin's Church, Bremhill, Wiltshire.

The Wiltshire property alone brought in more than £2,000 p.a. in rents and Henry's income after succeeding to the estate was reckoned to be double that figure.

Bromham was an important weaving centre, but the weavers suffered severely during depressions in the cloth trade. In 1612 Sir Henry built six little cottages in the village of Bromham for the poor people of the town, probably intended for impoverished weavers.

Henry Bayntun died on the 24th September 1616. A stone set in the aisle floor (under the table) in the Bayntun Chapel, in the Church of St. Nicholas, Bromham is the only memorial to him. This was taken from the Almshouses just prior to their demolition in 1964.

His wife Lucy survived him and died in the parish of St. Martin, in the Fields, in 1621 at Northumberland House, near Charing Cross, London. She was brought to Westminster Abbey, London on the same day. At the time of its foundation, the Church of St. Martin was "in the Fields" (the countryside) with very few buildings around it, and the name has stuck to this day. It is the City of Westminster, opposite Trafalgar Square.

The burial register at the Abbey indicate she was buried there on the 14th June 1621 at the entrance to St. John The Baptist Chapel (off the north ambulatory). Her grave is not marked (which is not unusual as many burials of the nobility were not even accorded stones or the family did not pay for a monument). Obviously she was of the right status to be allowed Abbey burial.

Her will, dated 23rd November 1620 was proved by her brother, Sir John Danvers, and her son, Sir Edward Bayntun and mentions her wish to be buried in the Abbey Church of Westminster.

Sir Henry Bayntun's memorial stone reads:
I was hungry and yee gave mee meate,
I was thirstie and yee gave mee drinke,
I was naked and yee clothed mee,
I was harbarles and yee gave mee lodginge.
Come yee blessed of my Father,
Inherit the Kingdom prepared for you.
Mat 25 Anno Chri 1612 et anno.

Sir Henry Bayntun died in 1616 and was succeeded by his eldest son and heir Edward Bayntun