In 976 AD, due to the Viking disruption to the Irish Brehon Law, the Heberian Dal gCais Septs in Thomond were well and truly on the ascendant, when 105.Mahon became the 39th King of Cashel / Munster, who was followed by his younger brother, *105.Brian Boru from the Ui Turlough Sept who also became the King of Thomond / Northern Munster and in 978 AD *105.Brian Boru defeated and slew 109.Molloy / Maelmuad the Heberian Eoghanacht Ui Raithlind 40th King of Munster in battle who had been involved in the previous death of his brother, 105.Mahon the 39th King of Munster, and *105.Brian Boru then became the 41st King of Munster. He then attempted to unite the ravaged Irish Tuaths / Family regions in Munster to stop any further Viking incursions also throughout Ireland, which had also destroyed the basic fundamentals of democratic elections within 4 generations to the various Irish Kingships under the Irish Brehon Law. In time, *104.Malachy 11 / Mael Sechlainn the Heremonian Dal Cuinn  "southern" Ui Niaill Clann Cholmain 40th King of Meath and 174th King of Ireland, whose base territory was in Meath / Midhe in the south - west of Northern Leinster, along with the Heremonian Dal Cuinn Ui Briuin kingdom of Breifne in the west in the Connacht Province, submitted to the overall Kingship of *105.Brian Boru. In 1002 AD he became the 175th High King of Ireland, who was then to end the ongoing Viking advance in 1014 AD in the Battle of Clontarf in Co. Dublin in the north - east of Southern Leinster where 7,000 Vikings and their allies were killed. Unfortunately *105.Brian Boru and his son, 106.Murrough and grandson, 107.Turlough were also killed.  His grandson, 107.Teigue O Briain was the first to use the O Briain / Ua mBriain surname, and 111.Donough Cairbre O Briain the son of *110.Donal Mor O Briain who would become the Dalcassian 47th King of Munster would also use it in respect of *105.Brian Boru’s wish for all the Irish people to use their descent from their main ancestor as their surnames. The Ui mBriain Tuath / Family region, later on split into the O Briens of Aherlow, the O Briens of Co. Waterford, and the O Briens of Arra in the north of Co. Tipperary and of Co. Limerick. They had their Tromra Castle near Quilty in Co. Clare, and another at Carrigogunnell in Co. Limerick.

       In 1542 AD on July 1st; 121.Murrough - the Tánaiste / heir apparent O Briain was to accept English titles and the re - grant of the Dal gCais Sept's territory to himself personally under English Law from Henry V111, although it was against the Irish Brehon Law, and he became the 1st English appointed Earl of Thomond and the 1st English appointed Baron of Inchiquin, and his nephew, 123.Donough O Brien the 1st English appointed Baron of Ibricken, This was to see the end of the leading Gaelic Milesian Dal gCais Septs as an Irish Tuath / Family, as the Dal gCais Septs then in reality were basically left leaderless. What was then the main leading Dal gCais Sept in Munster then became the English appointed Earls and Marquises of Thomond, English Earls of Inchiquin, English Barons of Ibrackan, English Barons of Burren, English Viscounts of Clare and the English Barons of Moyarta. These particular leading branches of the Sept were to fore sake their Gaelic Irish heritage and their Irish people to become "survivors" to hold onto the land in Co. Clare personally, and to do this they also had to become non - Catholic. They then married English women to gain financial reward to uphold their English titles and Estates until eventually most of their English titled main branches were to die out in 1741 AD with Henry O Brien being the English appointed 8th Earl of Thomond. Many of the O Briens in Co. Waterford including those in Comeragh, Ballyetragh, Salterbridge near Cappoquin and the River Blackwater in 1653 AD were to be transplanted by the English Protector Oliver Cromwell. Ancestors: *105.Brian Boru the direct male line ancestor of the Ui mBriain who was the King of Thomond, 41st King of Cashell / Munster and 175th King of Ireland who was born in 926 AD at Kincora in Co. Clare in the north - west of the Munster Province. He was slain buy Brodar the Dane in the Battle of Clontarf near Dublin on the 22nd April, 1014 AD at 88 years of age. He had 11 brothers, but only 4 left aristocratic warrior issue, 105.Mahon, one of his older brothers had been the 39th King of Cashel / Munster before him, 105.Donncuan, another brother, was to become the ancestor of the O Eustaces, the O Kennedys, the O Regans - of Thomond, the O Kellehers, the O Bolands / Ui Beollain, the O Caseys, The Powers, the O Twomeys etc, 104.Kennedy / Ceaneidigh his father was the King of Thomond who was married to Babhion the daughter of Arcadh the son of Murrough O Flaherty the Heremonian Dal Cuinn Ui Briuin King of Iar / West Connacht, 103.Lorcan / Fingin, his father was a son of 102.Lachtna who had his residence at the Grianan Lachtna near Killaloe in the north - east of Co. Clare, 101.Corc his father was a son of 100.Anluan the son of 99.Mahon who was born in 683 AD who was the son of 98.Turlough (Ui Turlough) the father also of 99.Ailgheanan the ancestor of the O Mearas, the O Scanlans and the Mac Arthurs, and was the son of 97.Cathal the son of 96.Aodh Caomh - the Gentle the first Catholic King of his Sept who was inaugurated the King of Munster in the presence of St. Brendan of Clonfert  and his poet Mac Lemein who later become the 1st Catholic Bishop of Cloyne, and also present at the ceremony was Aodh Dubh, the son of Criffan / Crimthann the Eoghanachta King. 96.Aodh Caomh became the ancestor of the O Coombes / Ui Caoimh and was the son of 95.Conall the father also of 96.Molua Lobhar / St. Molua - the Leper who founded the church at Killaloe in Co. Clare, and also of 96.Congal the ancestor of the O Noonans of Thomond and southern Connacht. 94.Eochy / Eochaidh Baill Dearg his father was a son of 93.Cairthenn  Fionn Oge Mor, the son of 92.Blood / Blod the direct male line ancestor of the Ui Bloid Sept the oldest of the 12 sons of 91.Cas the King of Thomond the ancestor of all of the Dal gCais Septs descended from *37.Eber Fionn the ancestor of all of the Heberian Septs.

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