839 AD. The Vikings feeling unfettered once again attacked the Cork area in Co. Cork in Southern Munster, and also Ferns in nearby Co. Wexford in the south - east of Southern Leinster and they now also had large fleets in the inland lakes, including Loch Neagh up in the north in the Ulster Province.

840 AD. The Vikings wintered on the lakes / lochs, and began to set up permanent settlements known as Long Phorts, which were defence areas situated from now on along the east - coast, especially in Dublin in the north - east of Southern Leinster, and also in Limerick in the mid - north - west of the Munster Province with Waterford in Co. Waterford along the coast also in the south - east of Munster, together with Wexford and Wicklow nearby along the coast in the south - east of Southern Leinster becoming Viking towns from there they were able to raid further inland plundering the larger monasteries, always after the gold and silver. 100.Felim / Feidlimid mac Crimthainn continued to be oblivious of what was now occurring.

            Meanwhile 100.Felim / Feidlimid mac Crimthainn the Heberian Eoghanacht Chaisil 23rd King of Cashel / Munster was keeping himself fully occupied by continuing to besiege the Heremonian Ui Cobhthaigh Dal Cuinn "southern" Ui Niaill territories of Meath / Midhe and Brega in the Midlands / Northern Leinster, where he decided to stay over at Tara in Co. Meath in the north - east, publicly displaying his intentions and disdain for the Ui Niaill Septs there following on from the old axiom that, "He who controls Tara controls Ireland." He later returned to Midhe / Meath and devastated their sub - kingdom of Delbna Bethra again, and the Heremonian Ui Cobhthaigh Dal Cuinn "southern" Ui Niaill kingdom of the Cenel Fiachach nearby, who were descended from 88.Fiachu who had been another of the 8 sons of *90.Niall - of the Nine Hostages the Gaelic Milesian 126th King of Tara / Ireland the aristocratic warrior ancestor of all of the Heremonian Ui Niaill Septs. Most of the territory there was under the control of the Fir Chell (The Men of the Churches) from the great monasteries, such as Durrow, Rahan and Lynally in Co. Offaly in the north - west of Southern Leinster and he also devastated the territory from Birr in Co. Offaly in Southern Leinster to Tara in Co. Meath in the south - east of Northern Leinster. He even went so far as seizing 102.Gormlaith the Queen of *101.Niall Caille mac Aeda the Heremonian Ui Cobhthaigh Dal Cuinn "northern" Ui Niaill Cenel nEogain 166th King of Ireland, who was also the daughter of *101.Donough Midi the previous "southern" Ui Nialil Clann Cholmain 163rd  King of Ireland.

841 AD. 105.Bran mac Faelain the Heremonian Ui Laoghaire Ui Lughaidh Cu Corb Ui Dunlainge 25th King of Leinster whose Heremonian Ui Dunchada Tuath / Family region, in Southern Leinster at this time was being further weakened by the increasing Viking settlement in Dublin in the north - east was also to come up against 100.Felim mac Crimthainn the Heberian Eoghanacht Chaisil 23rd King of Cashel / Munster who was continuing to express his overall authority there over Mogha's Half (Southern Leinster and the Munster Province), 100.Felim mac Crimthainn took his Munster forces to Carman where he intended to proclaim his over - lordship of Southern Leinster also and to celebrate an Oenach / Assembly, but 105.Bran mac Faelain's ally, *101.Niall Caille mac hAeda the Gaelic Milesian Heremonian Ui Cobhthaigh Dal Cuinn "northern Ui Niaill Cenel nEogain 166th King of Ireland was waiting for him and attacked him at Mag nOchtair near Cloncurry in Co. Kildare in Central Southern Leinster where they had previously met before. *101.Niall Caille mac Aeda was able to defeat him and this meant that *101.Niall Caille mac Aeda was now "definitely" the outright King of Ireland without any further opposition from 100.Felim mac Crimthainn who had finally run his last race.

842 AD. Forindan and Diarmait O Tiernan / Ua Tigernain the two previously opposing Abbots for the position at Armagh in the south - east of the Ulster Province were now working together in the Munster Province with the Law of Patrick / Cain Phadraig and 100.Felim mac Crimthainn the Heberian Eoghanacht Chaisil 23rd King of Cashel / Munster, now having no other personal individual agenda, met with both of them.

 845 AD. The Vikings who were set up in Limerick in the mid - north - west of the Munster Province captured Forindan, who was now the Abbot of Armagh, at Cluain Comarda in the territory of the Heberian Eoghanacht Ui Fidgeinti Septs in Munster where they also carried off the Shrine of St. Patrick and broke it.