The Stowe Missal, a Mass Book, was written in this Century at the Lorrha monastery in Co. Tipperary in the north - east of the Munster Province, which is still in existence and can be seen at the Royal Irish Academy in Dublin, while the metal Shrine that originally surrounded it can be viewed at the National Museum also in Dublin.

            102.Cormac mac Cuilennain became the Heberian Eoghanacht Chaisil 31st King of Cashel / Munster who was a very pious individual and historian and really did not want this position due to his strong religious convictions, but was pressured into accepting it and he too also tried to restrain the Heremonian Ui Cobhthaigh Dal Cuinn Ui Niaill Septs in the north in Conn's Half / Leath Cuinn endeavouring also to stop them from continuing to gain the total High Kingship of Ireland, which still did not exist under the tenants of the Irish Brehon Law. To further highlight the position that the the Heberian Eoghanachta Septs now found themselves in as to the Kingship of Cashel / Munster, 102.Cormac mac Cuilennain was not from one of the previous main Eoghanacht dynasties that had reigned up until this time, although he was a Chaisil King and Flaherty / Flaithbertach mac Inmainen who was from the Heremonian Ui Cobhthaigh Ui Conaire Muscraige Sept who were descended from *88.Conaire 11 who had been the 111th King of Tara / Ireland, and who was also the Abbot of Inis Cathaig was his back up, and was to follow after him, as a Heremonian King of Cashel / Munster, the first ever and the last Heremonian, and he was to be the last Irish King to be a cleric. (It was only during the Viking period that the Irish Kingships and religion became so involved and this was only in Mogha's Half / Leath Mogha).

          The Heberian Eoghanacht direct aristocratic warrior male line to 102.Cormac mac Cuilennain from 89.Conall Corc the original Heberian Eoghanacht Chaisil 1st King of Cashel / Munster who was himself 5 generations from 85.Eoghan Mor the aristocratic warrior ancestor of all of the Eoghanachta was through another of the 4 sons of 91.Angus / Oengus mac Nad Froich the 3rd King of Cashel / Munster namely, 92.Bressal who had never left a Munster King at any stage, and 102.Cormac mac Cuilennain was 11 generations back to him, and after him they would never leave another. 102.Cormac mac Cuilennain because of his great piety and as the Catholic Archbishop of Cashel, was especially selected to lead the Eoghanachta through these troubled times that they were by now experiencing due to the constant Viking disruptions. Because of his particular overall statesman like attitude to life 102.Cormac mac Cuilennain was to inform 103.Lorcan the Heberian Dal gCais Prince of the Heberian Dalcassians in Thomond / Northern Munster that they both traced to 84.Ailill / Oilioll Oluimm the 1st Heberian King of Munster who had been the son of 83.Mogha / Mug Nuadat the original Heberian King of Mogha's Half in the south of Ireland and of the original decree that had been set down by 84.Ailill Oluimm that their Celtic Gaelic Milesian Heberian kingdom in Munster Province was to be alternated between the descendants of his 2 older sons, 85.Eoghan Mor who became the aristocratic warrior ancestor of the Eoghanachta and 85.Cormac Cass the aristocratic warrior ancestor of the Dal gCais. He also advised him that previously 7 Heberian Kings from the direct male line of 85.Cormac Cass the ancestor of the Dal gCais had been Kings of Munster in their own right. 103.Lorcan then informed his son, 104.Kennedy and a new leading role then opened up for the Dal gCais Septs in the Munster Province.

          102.Cormac mac Cuilennain had previously also compiled the historical book known as the "Saltair of Cashel," which still existed up until 1454 AD, but it is now also lost.