The Normans in Ireland in the years after their arrival developed competing rivalries amongst themselves in the desire for land, resulting in the manipulation of the "factious Gaelic political system". This saw them back Gaelic lords competing with those allied to their rivals. Despite a king in this time being notionally seen as symbol of justice and arbiter, Henry II seems to have unofficially adopted a system of promoting inter-Norman rivalry, possibly as a means to rein in the power of his subordinates in Ireland so they posed him no threat whilst he was occupied with continental European affairs. This was exemplified in 1172 by Henry II's granting of the Irish kingdom of Meath to Hugh I de Lacy to counterbalance Strongbow's domain in Leinster. De Lacy however had to seize it for himself, though his grant was not recognised by Tiernan O'Rourke, king of Breifne, and after stalled negotiations which saw an attempt to kill de Lacy, O'Rourke was killed.
During Lord John's revolt against his brother Richard I between 1193 and 1194, the Normans in Ireland were divided in their allegiance. De Courcy, Walter de Lacy, Lord of Meath, along with Cathal Crobderg O'Connor, King of Connacht, who remained loyal to the English king, joined forces against William de Burgh. Despite de Courcy and Hugh II de Lacy of Meath combining to invade Connacht on behalf of O'Connor in 1200, de Courcy and de Lacy would become enemies and after several battles saw de Lacy granted de Courcy's possessions in Ulster. De Courcy rebelled and took refuge in the Irish kingdom of Tyrone. In 1196, de Courcy and Niall MacMahon of Oriel attacked English Uriel. A year later Irishmen assisted de Courcy in wasting the north-west after his brother had been killed by an Irishman in his company.
11 сен 2024