Henry Constable matriculated as a fellow commoner at
St John's College, Cambridge at Easter 1578, and took his BA on 29 January 1580. His contemporary at Cambridge was
Robert Devereux, 2nd Earl of Essex. He was enrolled at
Lincoln's Inn on 21 February 1583, but there is no further record of his legal studies. On 12 September of that year Constable was in Scotland. He was then posted to Paris on the recommendation of his father's friend,
Sir Francis Walsingham, serving under the English ambassador there,
Sir Edward Stafford, between 14 December 1583 and April 1585. In May 1585 he was at
Heidelberg, and he may have travelled to Poland. During this period, according to Sullivan, Constable acted as a spokesperson for Protestant causes. Constable was probably at the English court during 1588–9, as he is recorded as having attended the funeral of his kinsman,
John Manners, 4th Earl of Rutland, in March 1588, and as having been in contact with
Arabella Stuart in 1589. During this period he was reported to have been one of Queen Elizabeth's favourites. He was sent to
Edinburgh in 1589 on the occasion of
King James VI's marriage, and by this time was a member of the circle of
Robert Devereux, 2nd Earl of Essex. His religious convictions were still to outward appearances Protestant. About this time he is credited with having written the anonymous tract
Examen pacifique de la doctrine des Huguenots, published in September 1589, in which, according to Sullivan, he wrote as a
Roman Catholic urging his countrymen to support
Henri IV, who had just been crowned King. Constable seems to have left Scotland with the French diplomat
Jean Hotman in October 1589, but returned in 1590, and wrote a sonnet, "To the King of Scotland upon the occasion of his longe stay in Denmarke by reason of the coldnesse of the winter and the freezing of the sea." In 1591 Constable went to
Normandy with the English forces under Essex who laid siege to
Rouen. At some time between his arrival in France and the death of his father on 12 November 1591 Constable openly embraced Roman Catholicism. Henri IV granted him a small pension. For the next decade he was principally based in Paris, but travelled to Rome in 1595. On 3 October 1596 he was in
Rouen, from which
Gilbert Talbot, 7th Earl of Shrewsbury, wrote to
Sir Robert Cecil that 'Here is Mr. H. Constable; who, lest he should have intruded himself into my company, I desired Mr Edmunds to let him know my desire he should forbear either coming, writing, or sending unto me, which he hath hitherto performed'. During this period he was also in
Antwerp and
Brussels. Until 1597 he kept up his connections with the Essex circle, writing to Essex himself and to
Anthony Bacon. He continued to claim loyalty to
Queen Elizabeth, and supported King James' claim to the English throne in preference to the claim of the Spanish
Infanta, daughter of
Philip II of Spain. On 1 March 1599 Constable arrived at
Leith in Scotland, and eventually obtained access to King James, remaining until September, 'hunting and conversing on poetry and divinity' with the King. In 1600 he again travelled to Rome to seek
Pope Clement VIII's approval of another visit to King James. On James's accession Constable hoped to return to England, and wrote first to friends in Scotland for support, and on 11 June 1603, to his kinsman,
Roger Manners, 5th Earl of Rutland, and to
Sir Robert Cecil. By December of that year he was back at court, and was granted a warrant on 8 February 1604 by which he obtained possession of his inherited lands. However his continued pursuit of plans to influence King James towards toleration of Catholics resulted in his imprisonment in the
Tower, where he remained from 14 April to 9 July 1604. The Venetian ambassador
Nicolò Molin heard that Constable had written letters to the Papal nuncio or envoy in Paris, which were intercepted, leading to his arrest. Constable was subsequently placed under house arrest, and deprived of his inheritance. He was in the
Fleet prison on 11 February 1608, when
John Chamberlain wrote to
Sir Dudley Carleton that no sooner was
Sir Tobie Matthew released, and 'no sooner gan nor his nest scant cold, when Harry Constable was committed in his roome and nestles in the same lodging'. Constable was imprisoned on at least one other occasion. On 31 July 1610 he was granted licence to leave England. He returned to Paris, and on 27 November 1611 rumours of his death were passed on by John Chamberlain to Sir Dudley Carleton: 'Sir William Bowes is lately dead, and we hear that Harry Constable hath taken the same way in Fraunce'. Little more is known of his activities apart from the record of his presence at a theological disputation on 4 September 1612. In 1613 his friend,
Cardinal Perron, sent him to
Liège on a mission to convert an English Protestant divine,
Benjamin Carier. Constable died at Liège on 9 October 1613. ==Literary accomplishments==