Henry inherited not just a crown from his father, King John, but also a country where the ranks below that of king demanded more authority and autonomy. Magna Carta was not enough, and civil unrest between the crown and less-loyal factions was a constant threat. There were also smaller conflicts that erupted into larger conflicts whenever the king took sides.
The Bishop of Winchester, Peter Des Roches, had been an important figure in Henry's youth, but in 1233 he demanded a manor be returned to a friend of his, Peter de Maulay, from Gilbert Basset, who currently held it due to earlier strife. Henry supported the bishop; Basset resisted; Henry called Basset a traitor; Basset fled to southern Wales where Richard Marshal held lands; Basset had been a friend of Richard's older brother, William, who had been the 2nd Earl of Pembroke after their father. Richard felt he should shelter and support his brother's old friend, so that's what he did.
This was a tense situation. Henry did not want to alienate Richard, and a date was sent to discuss the matter face-to-face in Gloucester, but Richard did not trust that Henry might not use the event to arrest him, so he refused to meet. Henry sent the Bishop of St. Davids to threaten Richard that his relationship with the king was in danger of being cut off. Meanwhile, the king's bailiffs demanded that one of Richard's castles, Usk Castle, be surrendered to them, with which his garrison at Usk complied.
Richard probably did not want to appear to be in rebellion against the king, but when Basset decided to make a cavalry raid across England, he was forced to act. He decided to stick with his original support of Basset. Richard allied with Prince Llywelyn ab Iorwerth of Gwynedd, and quickly seized Usk and other castles. They continued to Monmouth, where Baldwin III, Count of Guînes, came out to fight. The illustration above is from historian Matthew Paris, showing Richard unhorsing Baldwin.
Richard did not have enough forces to go as far as London and challenge the king. Meanwhile, Henry did not want to commit too many forces to deal with Richard, and hoped for a peaceful settlement. A truce with France was coming to a close, and Henry feared using up troops at home in a rebellion when they might be needed on the continent to defend English-held territory there. An attempt at peace on 1 April 1234 negotiated by Templars failed, and a fight broke out during which Richard was wounded. He succumbed to his injuries on 15 April, and the rebellion died with him.
I was going to tell next about one of Henry's policy decisions that the modern world would condemn, but I feel the need to take a side trip to Matthew Paris, whose work has been mentioned several times throughout this blog but has never been given his own entry. That's for tomorrow.