Aelfgar, earl of Mercia was outlawed by the witan. In revenge he built a force and allied himself with Welsh Gruffydd ap Llywelyn. After defeating the King's nephew, Radulf, they attacked Hereford and raided the church killing several canons and taking everything of value leaving the building on fire. The rebels also attacked Leominster. ^[1] [2]

In reponse to the attack on Hereford Catherdal, Leofgar the bishop of Hereford took an army into Wales to deal with the Welsh prince. In battle Gruffydd ap Llywelyn killed the bishop and others near Glasbury on Wye. Earl Godwin raised an army in response but the two side eventually came to peaceful terms and Aelfgar was later restored to his position. ^[1]