What is the meaning behind the phrase "dia brisistair na reanna aicsidi & nemaicsidi fair"? It appears in the dinnshenchas of Ess Ruaid as follows-
"No comad o Æd Ruad mac Baduirn .i. o rig Erenn nohainmnichthea dia rofhelleastair ara oclach ina thuaristal, dia brisistair na reanna aicsidi & nemaicsidi fair, coro greis in t-oclachna curu i cenn in rig .i. muir & gæth & grian & coitheoir& firmaimint, cor’ thogair Æd tre theasbach dul ’sancas da fothrucud. Eas nDuinn meic Dubain meic Bili a hainmroime sin nocor’baithead Æd tre firt mara & morgaithi. Undedicitur Eas Ruaid."
Translated as- "Or it may have been named from Aed Ruad son of Badurn,king of Ireland, when he defrauded his champion concerninghis stipend, and broke upon him the stars, visible andinvisible. Thereupon the champion incited against the kingthe sureties, to wit, sea and wind, sun, ether and firmament,and called Aed, by means of (the sun’s) sultriness, to enter therapid and bathe. Ess Duinn ‘the Rapid of Donn, son of Dubán,son of Bile’ had been its name before that, till Aed was drowned (therein) by a miracle of sea and mighty wind. Hence Ess Ruaid (Aed) Ruad’s Rapid is said."