Relating to the Dalcassians, an ancient Irish people who inhabited what is now County Clare and surrounding regions in medieval Ireland.
From the Dalcassians (Gaelic Daol Chais), an Irish ethnic group whose name appears in medieval Irish genealogies and chronicles. The suffix -ian marks it as a relational adjective.
The Dalcassians produced one of Ireland's greatest kings, Brian Bóruma (Brian Boru), who briefly united Ireland—so this obscure adjective connects to medieval Irish history's most dramatic moments!
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