The monastery was flourishing at the time the
manuscript was given to Hailes Abbey but there were difficulties ahead.
The Black Death or bubonic plague struck in 1349, reducing the size of the
community and seriously affecting its economy. A fire in 1398 destroyed
the Abbey, its books and artefacts. Excavations at the end of 20th century
revealed layers of charred wood which were under layers of stones enabling
archaeologists to date the fire with some certainty. The date and fact of
the fire are further reinforced by the evidence of a letter from Pope
Boniface IX which reads as follows: