Moira () is a village and civil parish in County Down, Northern Ireland. It is in the northwest of the county, near the border with counties Antrim and Armagh. The M1 motorway and Belfast–Dublin railway line are nearby. The population was 4,591 at the 2011 Census. The etymology of Moira is somewhat uncertain. It seems to be an anglicisation of the Irish Maigh Rath, which may mean either 'plain of the wheels' or 'plain of the ringforts'. Another Irish form of the name is Mag Rath. The change most probably occurred during or before the Plantation of Ulster. Regardless Moira has now evolved to become both the official name and the one in everyday use. Prehistoric IrelandEarly Medieval Ireland 800–1166Early Christian Ireland and Ireland 1536–1691 Moira has been a settlement for at least 1,500 years. For the period it consisted most probably only of small dwellings surrounded by several earthen ringforts. Evidence of three such forts still remain. The best known of these is the so-called "Rough Fort", situated on the Old Kilmore Road. However, the remains of "Pretty Mary's Fort" exist behind the Waringfield residential area. Finally evidence of a third ringfort can be found near Claremont. In fact the supposed ring fort in Moira is actually a henge dating back thousands of years. see the book "Finding Footprints" by David McFarland. The existence of these primitive defences, coupled with the good-view afforded from the top of Moira hill, made the settlement strategically valuable. Proximity to Lough Neagh enhanced this value. Accordingly, during the repeated power struggles of the first millennium the area was often fought over, and eventually witnessed the largest battle in the history of Ireland when three tribal kings contested the area to determine supremacy in Ulster and beyond. This was the Battle of Moira. Its impact on Moira is still felt; two townlands still bear battle names, Aughnafosker (meaning field of slaughter) and Carnalbanagh (meaning the Scotsman's grave).