''TheAonad gabháltas i nÉirinn desna 11ú agus 12ú haoiseanna ab ea '''tríocha céad''' ([[Sean-Ghaeilge]] '''trícha cét''') was a unit of land-holding in eleventh and twelfth century [[Ireland]].<ref name="Placenames">[http://www.placenamesni.org/landunits.php Place Names NI] - Land units</ref><ref name="one">MacCotter, Paul; ''Medieval Ireland: Territorial, Political and Economic Divisions'', lch. 13. [[Four Courts Press]], 2008. {{ISBN|978-1-84682-098-4}}</ref> TheIs termamhlaidh appearsgo todtugann relatean tot-ainm thele numberfios ofan líon saighdiúirí anarbh areafhéidir couldle hachar a raisechoinscríobh.<ref name="Placenames"/><ref name=Dillon>{{
