e for peace, and, after the failure of
earlier councils, set off to attend another assembly fixed for August
1, at Westminster. On his way he learnt from his sister Isabella, the
wife of Richard of Cornwall, that Peter des Roches was laying a trap
for him. In high indignation he took horse for his Welsh estates, and
prepared for rebellion.

The king summoned the military tenants to appear with horses and arms
at Gloucester on the 14th. There Richard Marshal was declared a traitor
and an invasion of his estates was ordered. But the king had not
sufficient resources to carry out his threats, and October saw the
barons once more wrangling with Henry at Westminster, and claiming that
the marshal should be tried by his peers. Peter of Winchester declared
that there were no peers in England as there were in France, and that
in consequence the king had power to condemn any disloyal subject
through his justices. This daringly unconstitutional doctrine provoked
a renewed outcry. The bishops joined the secular magnates, and
threatened their colleague with excommunication. A formidable civil war
broke out. Siward and Basset harried the lands of the Poitevins, while
the marshal made a close alliance with Llewelyn of Wales. The king
still had formidable forces on his side. Richard of Cornwall was
persuaded by Bishop Peter to take up arms for his brother, and the two
new earls, John the Scot of Chester, and John de Lacy of Lincoln,
joined the royal forces. Hubert de Burgh took advantage of the
increasing confusion to escape from Devizes castle to a church in the
town. Dragged back with violence to his prison, he was again, as at
Brentwood, restored to sanctuary through the exertions of the bishop of
the diocese. There he remained, closely watched by his foes, until
October 30, when Siward and Basset drove away the guard, and took him
off with them to the marshal's castle of Chepstow.

The tide of war flowed to the southern march of Wales. Llewelyn and
Richard Marshal devastated Glamorgan, which, as a part of the
Gloucester inheritance, was under the custody of the Bishop of
Winchester. They took nearly all its castles, including that of
Cardiff. Thence they subdued Usk, Abergavenny, and other neighbouring
strongholds, while an independent army, including the marshal's
Pembrokeshire vassals and the men of the princes of South Wales, wasted
months in a vain attack on Carmarthen. The king's vassals were again
summoned to Gloucester, w