Beyond those territories large areas of land previously held by authority of the English crown were taken by the resurgent Gaelic Irish, particularly in the north and midlands. Among the most important septs were the O'Neills (Uí Néill) in central Ulster (Tír Eóghain), flanked to their west by the O'Donnells (Ua Domnaill); the O'Byrnes (Ua Bróin) and O'Tooles (Ua Tuathail) in County Wicklow; the Kavanaghs (Ua Caomhánach) in County Wexford; the MacCarthys (Mac Cárthaigh) and O'Sullivans (Ua Súilleabháin) in County Cork and County Kerry; and the O'Brien (Ó Briain) lordship of Thomond in County Clare.