[5][6][7][a] The three brothers would sire the three Devereux families that would play an integral role in controlling the Welsh Marches during the thirteenth century.
During the summer of 1208 King John used de Braose's escalating debt and refusal to provide a hostage, to seize his lands and order the arrest of his family.
Braose's supporters such as John Devereux, and any providing him aid including William Marshal, the earl of Pembroke,[10] were the subjects of royal disfavor.
The grant ran from Lazhargalvan up to Mezhan, and as the water of Avenmore runs to Dufglas, and along the water of Dufglas to the nearest ford of Leichemaelergin; and as those said lands extend in Slefto to Sleftrun, that is to say Anach and Seunach, Killorzhie, Adentein, Crumachtan, Sheskin, Balinoe, Razhinakennardy, Baliachan, Affane, Ballymalaly, Balimithyan, Balykennedy, Ballydonan, Cappagh, Ross, Caselan, Kilcounan, Moy, Thelghy, Tholach, Henan, and Kulman.
[20] This deed also confirmed the grants of their father, Walter Devereux; made mention of their mother, the widow Cecilia; and was acknowledged by Gilbert de Lacy.
In his absence the Justiciar of Ireland was ordered to take fitzAnthony's lands into hand as he was accused of detaining some of the King's escheats.
About 1225 Devereux witnessed the granting of a license by Walter Clifford for 1 mark to the monks of Salop for the grazing of their goats in the woodland of Lawton.
[21] Richard de Burgh regained the position of Justiciar in 1226, and by December Devereux's lands were again placed in his custody probably for being among those said to be holding their castles 'against the king' in August 1226.
Henry III attained legal majority in October 1228, and the 2nd earl of Pembroke regained royal favor.
[24] That same year the 2nd earl of Pembroke accompanied King Henry III on an expedition to Brittany, and John Devereux was probably in his retinue.
[2] The refusal of the Justiciars of Ireland to implement certain royal orders, though, caused John to still be seeking seisin of his lands in the Decies in 1233.
Some suggest this was intended to restrain them from supporting Richard Marshal, but it probably was aimed at keeping them from breaking a current truce with Llywelyn.
[28] In August 1233 revolt broke out along the Marches led by Richard Marshal, earl of Pembroke, and Walter de Clifford, Marcher Lord.
On 17 August Devereux, William Mauduit (Lord of Hanslope), and Mathew Maung were issued charters that contained an oath of allegiance they had to make vowing forfeiture of their lands should they not serve Henry III faithfully.
On 10 September 1234 the king instructed Maurice fitzGerald, justiciary of Ireland, to investigate the complaint of Geoffrey de Turville, Archdeacon of Dublin, that John Devereux, William of Wales, and others were placing clerks in the chapels on their lands, and that the right of appointment to these chapels belonged to the Archdeacon.
[33] About 1244 John Devereux granted to his son, Vincent de Ebroicis, and his heirs his remaining five carucates (600 acres) of land in Ireland representing the fourth part of a knight's service of the fee of Donoughmore, barony of Fertagh.
[34] The fee extends between the Cullahill Mountains to the east of side of the river Nore at Ballyragget, and borders on the southwest with Philip de Rocheford's lands in the parish of Sheffin, and on the south with the monks of Jerpoint in Grangemacomb.
In the 1240s there is a reference to a release by Robert de Wilmeston, son of Roger de Chandos (Lord of Snodhill), to the monks of Dore of all the land upon the Godway (Blakemere) in Hereford, which the said monks held from Sir John Devereux, from the upper part of Wadel (tributary of the river Lugg) to the boundaries of Malfeld (in Peterchurch) and Isaacsfeld (abutting on a meadow called 'Wetemore).