Hervey's identification of the sitters has remained the standard one, affirmed in extended studies of the painting by Foister, Roy, and Wyld (1997), Zwingenberger (1999), and North (2004), who concludes that "the general coherence of the evidence assembled by Hervey is very satisfying"; however, North also notes that, despite Hervey's research, "speculation did not stop at once and is still not entirely dead". Giles Hudson, for example, has argued that the man on the right is not de Selve, but Jean's brother François, Bishop of Auxerre, a noted patron of the arts with a known interest in mathematical instruments. The identification finds support in the earliest manuscript in which the painting is mentioned, a 1589 inventory of the Chateau of Polisy, discovered by Riccardo Famiglietti. However, scholars have argued that this identification of 1589 was incorrect. John North, for example, remarks that "[This was a natural enough supposition to be made by a person with limited local knowledge, since the two brothers lived on the family estates together at the end of their lives, but it is almost certainly mistaken". He points to a letter François de Dinteville wrote to Jean on 28 March 1533, in which he talks of an imminent meeting with the Pope and makes no mention of visiting London. Unlike the man on the right of the picture, François was older than Jean de Dinteville. The inscription on the man on the right's book is "AETAT/IS SV Æ 25" (his age is 25); that on de Dinteville's dagger is "AET. SV Æ/ 29" (he is 29).