Dating county clare
After the Norman invasion of Ireland, Thomas de Clare established a short-lived Norman lordship of Thomond, extinguished at the Battle of Dysert O'Dea in 1318 during Edward Bruce's invasion.
There are two main hypotheses for the origins of the county name "Clare".
In the mid-10th century, it was annexed to the Kingdom of Munster to be settled by the Dalcassians. Brian Boru became a leader from here during this period, perhaps the most noted High King of Ireland.
From 1118 onwards the Kingdom of Thomond was in place as its own petty kingdom, ruled by the O'Brien Clan.
These divisions are cadastral, defining land boundaries and ownership, rather than administrative.
It was assigned to County Clare after the Municipal Corporations (Ireland) Act 1840.
Under the Local Government (Ireland) Act 1898, part of the judicial county of Galway (Drummaan, Inishcaltra North and Mountshannon electoral divisions) was transferred to county Clare.
Bodies of water define much of the physical boundaries of Clare.
To the southeast is the River Shannon, Ireland's longest river, and to the south is the Shannon Estuary.