The BBC article can be seen at Duke of Norfolk Tudor portrait could fetch up to £3m at auction
The sale notes from Sothebys can be read at Portrait of Thomas Howard, 4th Duke of Norfolk (1538–1578) These add to the information about the work, in particular, with regard to the heraldic backcloth.
For those who want some more information about the Duke and his downfall, the Ridolfi Plot, and the fate that befell his eldest son and heir, St Philip Arundel, there are Wikipedia articles but which seem reluctant to download,so I will suggest readers go to them directly.
Unfortunately I do not think these are necessarily very good when seeking to explain the politics, and more, especially the religious politics of the 1560s and early 1570s.
The articles describe people as being either Roman Catholic or Protestant At a time where there was still considerable fluidity between those recognisable, but not necessarily fully distinct groupings. It was not until 1570 that Queen Elizabeth I was excommunicated by Pope Pius V in the bull Regnans in Excelsis eleven years after the Queen and her Parliament has reinstated the Royal Supremacy and Anglican worship. Whilst many of the Queens closest advisors, notably William Cecil, can definitely describe as Protestant - the term had by then been coined in Germany - for some, at least Anglicanism was mainly a stage towards a more radical alternative. Although they were a considerable number of the queen subjects whose commitment to Catholicism had sent them into exile or into active recusancy. The Catholicism that emerged from the Council of Trent had still to make its impact on the life of Catholic Christendom - for example the newly collated missal was not published until 1570. The more streamlined faith of the missionaries from Douai and Rheims, still less the Jesuits, not yet begun their endeavours. The more stringent and deadly anti-Catholic measures of the later years of Queen Elizabeth had not yet been introduced, For many others, there was the confusion of adapting to the new dispensation. In many ways, the fourth Duke of Norfolk exemplifier this. Raised in the Catholic culture of the later years of King Henry VIII and in the reign of Queen Mary I, and heir to a conservative aristocratic family he nevertheless appears to have settled into, they new Elizabethan era, if on the Catholic side of the spectrum. His third wife, Elizabeth Dacre was more explicitly Catholic in her beliefs.
I suspect that, when Norfolk was drawn into the plants to marry him to the exiled Queen of Scots, who for all her Catholicism had ruled over what was officially a reformed realm, such a marriage would not necessarily imply a Catholic restoration as it happened under Philip and Mary. Ridolfi may well have misread the English political situation. For all his Catholic background the Duke had had as a tutor and remained in contact with the Protestant martyrologist John Foxe, with whom he remained on good terms until his last days, and Foxe’s college roommate Alexander Nowell, Dean of St Paul’s, who had definitely reformist and idiosyncratic lideas, ministered to him in the Tower and with Foxe accompanied him on the scaffold, where in his words to the crowd the Duke denied being Catholic.
It is a long time sine I read Neville Williams’ biography Thomas Howard Fourth Duke of Norfolk and the Jesuit historian Francis Edwards’ The Marvellous Chance but both are well worth reading. Williams’ book makes a sympathetic case for the Duke, who became entangled, surpringly, but also too easily, in the circle of Mary Queen of Scots, and then in Ridolfi’s machinations. Fr Edwards suggests that that conspiracy, like others later around the Scottish Queen, were at least in part directed by English minister like Cecil anxious to destroy both Mary and anyone likely to support her. Only a few years previously Cecil was eloquent in his praise for Norfolk’s skills, and he had been put forward by Queen Elizabeth, along with Leicester and Darnley as a potential husband for Mary when she was still the widow of Francis II. To that extent Norfolk was a victim of his own hubris, and his rivalry with the Earl of Leicester, and now, unbeknownst to him, with Cecil, who single-mindedly targeted Mary of Scots, as John Guy has shown so well. Like his father a quarter of a century earlier he was the victim of deadly court factionalism, and quite possibly an unwitting one.
The politics surrounding his actual execution in 1572 is set out in a blog from the History of Parliament which can be read at The execution of Thomas Howard, 4th duke of Norfolk.
There is a much better online biography of the Duke than that on Wikipedia from the Tudor Society at Thomas Howard, 4th Duke of Norfolk
I very much hope that the new owner of this portrait will be one that means that it remains on display in this country.
