981 - 990 AD
981 AD *107.Malachy 11 / Mael Sechnaill the Gaelic Milesian Heremonian Dal Cuinn "southern" Ui Niaill Clann Cholmain 174th King of Ireland defeated the Viking forces who were attacking Tara in Co. Meath in the south - east of Northern Leinster this year, who were also constantly invading his territory there from out of their settlement to the south in Dublin in Co. Dublin in the north - east of Southern Leinster.
*105.Brian Boru - of the Tributes who was now the Heberian Dal gCais Ui Bloid Ui Turlough King of Thomond / Northern Munster and also the 41st King of Cashel / Munster, besieged the Heremonian Ui Laoghaire Ui Connla kingdom of Ossory in Co. Kilkenny in the south - west of Southern Leinster, which was situated in Mogha's Half / Southern Ireland, to the east of the Munster Province, to begin his total subjection of the Vikings there also, and to show his overall authority over the whole of Mogha's Half.
982 AD
*107.Malachy 11
/ Mael Sechnaill
the
Gaelic Milesian
Heremonian Dal Cuinn "southern"
Ui Niaill Clann
Cholmain 174th King of Ireland was able to defeat
the Vikings in Dublin in Co. Dublin in the north - east of
Southern Leinster
this year and gain control of the territory there, while attempting to stop their constant raids
from there into his territory to
the north in Northern Leinster.
For political reasons and hoping to create immediate
goodwill he then put the Viking settlement
there under the control of
Sitric Silkbeard the the half - Viking
King, who was a son of the Southern Leinster
Princess 110.Gormlaith and
the recently deceased Viking King,
Aulaf's / Olaf Cuaran. To
expand his political influence there further, he was
983 AD Despite the best efforts of *107.Malachy 11, *105.Brian Boru who was now the Heberian Dal gCais King of Thomond / Northern Munster and the 41st King of Cashel / Munster this year was able to also bring Southern Leinster totally under his control, and he also gained hostages from the Septs there for their good behaviour in Mogha's Half (Southern Leinster and Munster Province.)
984 AD *105.Brian Boru as the Heberian Dal gCais 41st King of Cashel / Munster was now supreme in Mogha's Half / Southern Ireland, and he was on the way to also eventually subjecting *107.Malachy 11 / Mael Sechnaill the Heremonian Dal Cuinn "southern" Ui Niaill Clann Cholmain 40th King of Meath and Gaelic Milesian 174th King of Ireland, as well as the Connacht Province in the west, and the Ulster Province in the north as he was determined to bring the Viking menace in Ireland under his overall control and therefore to an end.
Eochy O Flynn / Eochaidh Ua Floinn the Chief Ollamh of Ireland, died.
986 AD Brian O Hea the Heberian Dal gCais Erenagh of Egles Beg of Clonmacnoise in Co. Offaly in Southern Leinster, died.
987 AD The
Mac Namaras
from the Heberian Dal gCais
Ui Caisin Sept who were descended from 92.Caisin, the second
eldest son of the 12 sons of
91.Cas the direct male line ancestor of all the
Dal gCais / Dalcassian
Septs acted as the Lord Marshalls for *105.Brian
Boru who was now the King
of Thomond
/ Northern Munster
and
41st King of
Cashel / Munster,
who was descended from the eldest son of
91.Cas, 92,Blood /
Blod (Ui Bloid)
and as such were to extend the overall authority of
*105.Brian
Boru
in
Ireland,
so they
took their
Dalcassian warriors under their
command, and besieged the
Heremonian Dal
Cuinn
Septs
in nearby
Connacht Province, but
they were not
led by *105.Brian
Boru himself, and they were
defeated by the
Heremonian Dal Cuinn Ui
Briuin Septs there who were now under the leadership of
110.Cathal
O Connor the
Heremonian Dal Cuinn Ui Briuin Ai
Siol Muireadhaigh / Sil Murray 46th King of
Connacht.
*105.Brian Boru as the Heberian Dal gCais King of Thomond and 41st King of Cashel / Munster meanwhile had begun to restore the old Celtic values, and being very religious he also built many churches, and repaired the monasteries, and old seats of education, which he also revived, as he sought books of learning from many foreign lands, and constructed roads and bridges and also improved the original Palace of the Heberian Dal gCais Ui Bloid Ui Turlough Sept at Kincora in Co. Clare in the north - west of the Munster Province. By this time also the Vikings too were now also settling into the Celtic Gaelic way of life, and *105.Brian Boru decreed that if they wanted to remain in Mogha's Half in Ireland they should also serve him in times of conflict.
988 AD Endeavouring to extend his overall authority further in Ireland, *105.Brian Boru the Heberian Dal gCais King of Thomond and 41st King of Cashel / Munster besieged the Heremonian Dal Cuinn "southern" Ui Niaill kingdom of Meath, in the south of Northern Leinster, from out of his fleet on Loch Ree, which was the actual territory of *107.Malachy 11 / Mael Sechnaill the Gaelic Milesian Heremonian Dal Cuinn "southern" Ui Niaill Clann Cholmain 174th King of Ireland. The consistent Viking threat throughout Ireland had totally disrupted the Brehon Law, and also the previous control over the Kingship of Ireland that the Heremonian Dal Cuinn Ui Niaill had held in Ireland for so long, and it was now on for one and all, for the "survival of the fittest," to see who could gain the overall High Kingship and actually put a stop to the Viking raids and *105.Brian Boru was determined that it would be him.
989 AD *107.Malachy 11 / Mael Sechnaill as the 174th King of Ireland attacked the Viking Danes in Dublin for 20 days and also decided to retaliate against the previous Heberian Dal gCais insurgency into his kingdom of Meath in Northern Leinster by besieging the Munster Province with his Heremonian Dal Cuinn Ui Niaill warriors this year, and from now on for a few years ahead the Heremonian Dal Cuinn "southern" Ui Niaill and the Heberian Dal gCais were to continue to engage in intermittent hostilities. The position of *107.Malachy 11, as the High King of Ireland naturally was now under threat and he needed to re - assert his Heremonian Dal Cuinn Ui Niaill authority, especially over the rising fortunes of *105.Brian Boru. This insurgency into his personal kingdom of Meath also had an effect on the other Septs nearby in the Connacht Province and also in Southern Leinster, as they could all now see that the Heberian Dal gCais under the leadership of *105.Brian Boru was growing in overall authority and strength.
105.Marcan who was another
brother to
*105.Brian Boru
was at this time a monk and the Abbot of Killaloe and also the
Bishop of Emly
in
Co.
Tipperary in the north - east
of
Munster.
The Vikings this year captured a scholar at Ross Carbery (The Wood of the Ui Cairbre Sept) in Co. Cork in Southern Munster and demanded a ransom for his return, and as it was in his territory 105.Brian Boru paid up, and he was released on Scattery Island on the River Shannon.
990 AD *107.Malachy 11 the Gaelic MIlesian Heremonian Dal Cuinn "southern" Ui Niaill Clann Cholmain 174th King of Ireland was once again forced to retake the Viking settlement to the south of his territory in Dublin in Co. Dublin in the north - east of Southern Leinster by force from the Vikings there, as they continued on to still carrying out their raids into his territory to the north of there in Northern Leinster.