Hugh Despenser the Younger took possession of the lordship of Glamorgan in South Wales, part of his wife Eleanor de Clare's inheritance from her late brother the earl of Gloucester, in November 1317. A number of letters from Hugh as lord of Glamorgan to Sir John Inge, the sheriff of Glamorgan, still survive, the earliest of them written during Edward II's disastrous siege of the port of Berwick-on-Tweed in September 1319 and the last three years later. Three of the letters are printed in the original Anglo-Norman in volume 3 of Cartae et Alia Munimenta quae ad Dominium Glamorgancia Pertinent, others are calendared in English translation in Calendar of Ancient Correspondence Concerning Wales, and one was printed in an 1897 English Historical Review article by W.H. Stevenson, also in the Anglo-Norman original. The originals are mostly held in the National Archives. Most of the letters are very long and very detailed, and reveal several things: that Hugh Despenser the Younger micromanaged the affairs of Glamorgan even when he was far away from his lordship; that he endlessly hectored the unfortunate John Inge and demanded that the sheriff bend over backwards to do everything he wanted; that he was a hard man to please and serving him was a thankless task; and that he felt a certain degree of contempt for the Welsh people.
It's the last of Hugh the Younger's letters to John Inge that I want to look at today, which is printed on pp. 1101-04 of Cartae et Alia Munimenta, vol. 3. Unlike most of his letters to Inge, it's not dated, but from references within the letter it's apparent that it must have been written in the autumn of 1322. Firstly, the Robert Lewer situation was still ongoing, and Edward II ordered Lewer's arrest on 16 September 1322; and secondly, Hugh wrote that he was following up the matter of the forfeited manor of Iscennen, and Edward granted Iscennen to him on 6 November 1322. Part of the letter refers to Hugh's dealings with Edward's niece Elizabeth de Burgh, whom Hugh politely but rather coldly called la dame de Burgh, 'Lady de Burgh', without acknowledging his relationship to her as his wife Eleanor's sister, as would have been usual and conventional.
In the middle of the very long missive, Hugh wrote, seemingly casually before moving on to talk about Robert Lewer, the following hair-raising sentence:
"And know that we trust you more the more you advise us, but we are very worried about having some reason for which we might be prepared to harm you in some way, or for which we might lose the good will which we have for you."
Ouchie. At some point not too long afterwards, though I don't know exactly when - probably in 1323 or 1324 - Hugh Despenser the Younger imprisoned Sir John Inge and all his council in Southwark because of his 'rancour towards him'. He made Inge and six guarantors promise to pay him £300 for Inge's release, and they had handed over £200 of it by the time of Hugh's downfall in November 1326. In February 1333, Edward III respited the remaining £100 on the entirely true and accurate grounds that the debt was "obtained by force and duress". One of Inge's councillors, Thomas Langdon, died while imprisoned by Hugh, and a petition about him presented probably in 1327 when it was safe to talk about the Despensers' many misdeeds also talks of Hugh the Younger's anger towards Sir John Inge (por corouz qil avoit vers mons' Johan Inge). 
John Inge was pardoned in early 1327 at the start of Edward III's reign for having adhered to Hugh Despenser the Younger, though one could hardly blame him if he heaved a sigh of relief when Hugh fell from power and was executed in November 1326.  For years, John received endless letters from Hugh that basically say "Do this, do that, go over there right now. No, not like that, you fool, like this. I'm keeping a copy of this letter and you'll regret it if you don't do exactly what I say. Don't make me hurt you." After years of falling over himself to do everything that Hugh wanted in exactly the way he wanted it done, this was John Inge's reward: to be threatened with being harmed, then imprisoned with his councillors, because he had angered Hugh in some way. Chroniclers tell us that even the great English magnates were frightened of Hugh Despenser the Younger, and Queen Isabella certainly was. It's not hard to see why.
Below, part of Sir John Inge's petition to Edward III requesting that he and his guarantors might be pardoned the remainder of their debt to the late Hugh the Younger.
1) Calendar of Close Rolls 1318-23, pp. 723-4; Calendar of Patent Rolls 1330-34, p. 404; The National Archives SC 8/176/8753 and SC 8/59/2947.
2) CPR 1327-30, p. 32.