A younger son, Tyrell was from a wealthy and extremely well connected family. His father was a Speaker in three Parliaments and the wealthiest member of the Essex gentry in the mid 1430s. John Tyrell’s connexions were impressive, for he served several important magnates, including Humphrey, duke of Gloucester, as well as Henry VI, for whom he was an officer of the duchy of Lancaster, a councillor and treasurer of the Household.
There is a lack of definite evidence for Tyrell predating the later 1430s. It is possible that he should be identified with the William Tyrell serving as a mounted man-at-arms at Arques under Sir John Montgomery* in March 1436, although the first certain reference to him is his appointment as steward of the duchy of Lancaster in Essex, Hertfordshire and other counties in the south-east of England in the following January.
In the wake of events in Cambridgeshire, the Crown found a more gainful outlet for Tyrell’s energies, appointing him to accompany the King’s secretary, Thomas Bekynton, later bishop of Bath and Wells, on an embassy to Gascony in the spring of 1442. The purpose of the mission was to enter negotiations with Jean, count of Armagnac, who had proposed a marriage between his daughter and Henry VI. Bekynton and his party reached Bordeaux in the summer of that year, and the city served as their base until they returned to England in February 1443. During their stay, they visited the constable of Bordeaux, Sir Robert Clifton*, on his deathbed, and Tyrell witnessed the will the knight made shortly before he died in September 1442.
About a year after returning to England, Tyrell waited at the King’s command upon Giles, the younger brother of the duke of Brittany, who was visiting England. Exchequer records show that he attended Giles for 48 days, for which he received wages of £8.
A few months after accompanying Margaret to England, Tyrell was appointed sheriff of Norfolk and Suffolk. During his term in the office he was sued in the Exchequer by two Norfolk husbandmen, who claimed that he had made a false return to a writ of trespass which the duke of Gloucester had brought against them.
At the elections to the following Parliament Tyrell witnessed the return of the MPs for Essex, the county where the main interests of his family lay, and during his career he participated in land transactions and other affairs of the gentry there, just as he did in Suffolk.
While Tyrell was escheator, the bishop of Winchester, William Waynflete, asked him to take custody on his behalf of a ward, Margery Pershut, a minor heiress from Hampshire (where the MP’s elder brother held lands). The reason for this request, and whether Tyrell was associated with the bishop in any other respects, is not known.
Another associate of Tyrell’s in the later years of Henry VI’s reign was a fellow Household man, Robert Whittingham II*. In May 1455 he and Whittingham acquired from the Crown the farm of several manors in west Norfolk which had belonged to the late Sir John Clifton, a distant cousin of the former constable of Bordeaux.
Following the accession of Edward IV, Tyrell lost his place on the Suffolk bench and the duchy of Lancaster office, and he did not long survive the change of dynasty. Edward’s hold on the kingdom was far from secure at the beginning of his reign, and there were rumours of conspiracies involving prominent supporters of Henry VI and their foreign allies during the winter of 1461-2. It was said that Margaret of Anjou had assumed the leadership of a great pan-national league dedicated to restoring her husband to the throne. This was certainly a wild exaggeration but by early 1462 the new government probably had good reason to suspect a serious plot. It instituted commissions of oyer and terminer to investigate trespasses and treasons throughout the country and on 12 Feb. John de Vere, earl of Oxford, and his eldest son, Aubrey, along with Sir Thomas Tuddenham*, John Clopton, John Montgomery* and Tyrell were arrested in Essex and brought to the Tower of London. A contemporary chronicler refers to those arrested with the earl as his ‘feed men’. According to one account, the prisoners had communicated with Henry VI and his queen, saying that they would join Edward IV on his campaign against the Lancastrian rebels in the north of England and then kill him when an opportunity presented itself, only to be betrayed to the Yorkist King by their conscience-stricken messenger. Another, perhaps more reliable, version states that Oxford had arranged with Margaret of Anjou for the duke of Somerset to land with a Lancastrian army on the Essex coast. Whatever the case, all of the arrested men, save Clopton, were charged with high treason and convicted before John Tiptoft, earl of Worcester, constable of England and son of Lord Tiptoft. Aubrey de Vere was beheaded on Tower Hill on 20 Feb., and his execution was followed by those of Tuddenham, Montgomery and Tyrell on the 23rd and of Oxford three days later. Their bodies were buried in the church of the Austin friars in London but it is likely that their heads were publicly displayed on London Bridge.
In spite of his conviction for treason, Tyrell was not attainted. Ironically, custody of his lands and his eldest son, James, still a minor, passed to the dowager duchess of York in her capacity as his feudal superior but, within a fortnight of his death, she sold them to his widow, Margaret, and her feoffees for £50.
