#rebecca holdorph argues for an earlier wedding date iirc

[une-sanz-pluis]

It was Gaunt who arranged Henry's marriage. The object of his attentions was Mary, the co-heiress to Humphrey de Bohun, earl of Hereford, Essex and Northampton, who had died at the age of thirty in January 1373, leaving no sons, two underage daughters, and a very substantial inheritance. The elder daughter, Eleanor (born in 1366), was married to Gaunt's brother, Thomas of Woodstock, earl of Buckingham, probably in 1374. What now happened to Mary (born in 1369–70) was naturally a matter of considerable interest to Buckingham. As long as she remained single, the entire Bohun inheritance would fall to him; were she to marry, he would be obliged to share it with her husband. Inconveniently, other duties now deflected his attention. On 3 May 1380, he indented with the king and council to lead an expedition to Brittany with a retinue of 5,000 men. During the following two months he did what he could to ensure that the Bohun patrimony did not slip from his grasp during his absence: on 8 May he obtained a royal grant of the custody of Mary's share of the inheritance during her minority; on 22 June Eleanor came of age and Thomas performed his fealty to the king for his wife's share of the lands. Shortly before leaving he even took the precaution of bringing Mary to stay with her sister at Pleshey castle (Essex), where he arranged for her to be instructed by nuns with the intention that she should join the order of St Clare. According to Froissart, ‘the young lady seemed to incline to their doctrine, and thought not of marriage’. Hopeful of having ensured the integrity of his inheritance, Buckingham shipped his troops to Calais and, on 24 July 1380, set out with his army on a campaign from which he would not return for nine months. No sooner had he done so than Gaunt made his move. Three days after his brother's crossing, he secured a royal grant of Mary's marriage, ‘for marrying her to his son Henry’, and shortly after this induced her mother, Joan countess of Hereford, to spirit her away from Pleshey and take her to Arundel, where the young couple were rapidly betrothed. They were married on 5 February 1381 in a service held at Countess Joan's manor of Rochford (Essex). The connivance of the king and council, who would have been aware of the blow this inflicted on Buckingham, is a measure of the financial and political leverage Gaunt exercised in Richard II's minority government. Gaunt attended and presented Mary with a ruby, as well as paying for the festivities; Henry's sisters, Philippa and Elizabeth, each gave their new sister-in-law a goblet and ewer. The king and Edmund earl of Cambridge (Gaunt's younger, and Buckingham's older, brother) may also have been there, for ten royal minstrels and four of Cambridge's minstrels received gratuities from Gaunt for enlivening the proceedings. There was nothing hasty or clandestine about the wedding.

Chris Given-Wilson, Henry IV (Yale University Press, 2016)