The Eóganachta kingship, which had its chief seat at
Cashel and chief church at
Emly, was the most powerful in the southern half of Ireland, while the various branches of the Uí Néill and
Connachta dominated the northern half. At this time, the Uí Néill were striving to be the sole
Kings of Tara, with the succession generally alternating between the northern and southern branches of the Uí Néill, although the ancient ceremonial kingship had not long before been held by the
Laigin and
Ulaid, and more distantly the
Dáirine and
Érainn. The kingship of Cashel, argued in early Munster sources,
e.g., the
Uraicecht Becc, as actually the most powerful in Ireland, was founded in the middle of the 5th century by the descendants of
Conall Corc and
Aimend, the "inner circle" of the Eóganachta, who after a century and a half of able politicking had come to supersede the overlordship of the
Corcu Loígde in Munster. For the century and a quarter until Cathal's death, the kingship of Cashel was dominated by the
Eóganacht Chaisil and
Eóganacht Glendamnach septs of the inner circle. The lands of the Glendamnach lay to the south-west of Cashel, in the middle valley of the
Blackwater. Cathal's father,
Finguine mac Cathail Con-cen-máthair (d. 696), uncle,
Ailill mac Cathail (d. 701), grandfather,
Cathal Cú-cen-máthair (d. 665/666), and great-grandfather,
Cathal mac Áedo (d. 628), had been kings of Cashel. While the Uí Néill and Eóganachta were the most important kingships in Ireland, the
kings of Leinster and the
kings of Connacht were significant forces. Leinster, once a much larger region, the northern parts of which had been conquered by the Uí Néill, was the target of expansionist Uí Néill kings, and also of the Eóganachta. The contest for control of Leinster would play a major part in Cathal's reign, and indeed in relations between the Eóganachta and Uí Néill in the centuries which followed. The kings of Connacht claimed a common kinship with the Uí Néill, and were largely favourable towards them. The remaining provincial kingship, that of the
kings of Ulster, controlled a much smaller area than the later province of Ulster, largely confined to the lands north and east of
Lough Neagh, and was generally hostile to the Uí Néill. Finally, in the vast province of Munster itself there were several respectable but peripheral dynasties, such as the
Uí Liatháin (for whom see below), whose relationships with the Eóganachta were rather distant and ambiguous. ==Early reign==