" In the case of Exeter, York’s superior blood status was explicitly recognized in the first duke of Exeter’s articles of ennoblement. The first duke died in 1447, but his heir, the young Henry Holland, was even more closely tied to York’s family: he was married to York’s daughter Anne, and had been in York’s custody when he was a minor. As recently as 1448 York and the duke of Somerset had been granted lands in joint trusteeship—a sign that there was no division (yet) perceived between those two men.7 Humphrey, "

― Dan Jones , The Wars of the Roses: The Fall of the Plantagenets and the Rise of the Tudors