, on folio 56r of National Library of Ireland 700 (
Expugnatio Hibernica), dating to circa 1200. The situation in Ireland remained relatively unchanged until the arrival of a significant force of mercenaries in the summer of 1169, after which some of Mac Murchada's former vassals began to come over to his side. According to
La Geste des Engleis en Yrlande, however, the kings of Uí Fáeláin and
Osraige, and Ascall—described by this source as the "lord" of Dublin—stubbornly refused to support Mac Murchada's cause. In an apparent show of force that may have been designed to keep the Dubliners onside, the
Annals of the Four Masters states that Ua Conchobair led an army to Tara, where he was joined by the forces of the kings of
Ulaid and Airgialla, after which the combined army marched upon Dublin. The following year, however, saw the arrival of even more English support for Mac Murchada; and in August 1170,
Richard de Clare, Earl of Pembroke landed in Ireland and took
Waterford by storm. Soon after, Clare married Mac Murchada's daughter,
Aoife (or Aífe), and effectively became heir to the kingship of Leinster and the overlordship of Dublin. Unsurprisingly, later in September, the combined forces of Mac Murchada and Clare marched on Dublin, where they confronted Ua Conchobair and his forces. If the account of the
Annals of the Four Masters is to be believed, the Dubliners switched sides at this point, deserted the cause of Ua Conchobair, and further suffered an act of
divine justice as their town went up in flames. On the other hand, the twelfth-century
Expugnatio Hibernica specifies that, whilst negotiations were under way between the forces of Ua Conchobair and the coalition of Mac Murchada and Clare, an English force under the command of
Miles de Cogan and
Raymond le Gros successfully assaulted the town, and caused considerable carnage amongst the inhabitants. Although the
Annals of the Four Masters specifies that the Dubliners were slaughtered in their fortress, after which the English carried off their cattle and goods, the
Expugnatio Hibernica instead states that the majority of the Dubliners escaped the massacre and retained most of their possessions. The same source states that Ascall and the Dubliners managed to escape into the "northern islands". This term could well refer to
Orkney. On the other hand, it is also possible that the term refers to the
Hebrides or
Mann; if so, this source would appear to be evidence that the Dubliners had retained close links with the Isles. According to the version of events preserved by
La Geste des Engleis en Yrlande, the coalition's conquest of Dublin took place on 21 September. ==Final defeat and death==