The treaty brought to an end Henry's invasion of Wales that had begun earlier that month.
In it, and the Treaty of London which followed in October, Dafydd agreed to cede large parts of modern-day Flintshire to Henry.
The treaty also obliged Dafydd to hand over his half-brother, Gruffudd ap Llywelyn Fawr, to Henry, who promptly imprisoned him in the Tower of London.
The king also became Dafydd's heir in case the latter died without living offspring.
The treaty effectively prevented Dafydd from pressing his rights to the territories controlled by his father Llywelyn until Gruffudd's death during an escape attempt on 1 March 1244, after which Dafydd invaded Flintshire and recovered his lost territory.