According to Irish mythology, Donn, or the Dark One, is the Lord of the Dead and father of Diarmuid Ua Duibhne, whom he gave to Aengus Og to be nurtured. Donn is regarded as the father of the Irish race; a position similar to that of Dis Pater and the Gauls, as noted by Julius Caesar. The mythology of pre-Christian Ireland did not entirely survive the conversion to Christianity, but much of it was preserved, shorn of its religious meanings, in medieval Irish literature, which represents the most extensive and best preserved of all the branches of Celtic mythology. ... In Irish mythology, Diarmuid Ua Duibhne (also known as Diarmuid of the love spot) was son of Donn and a warrior of the Fianna. ... In Irish mythology, Aengus (Áengus, Óengus, Angus, Aonghus, Anghus) aka Aengus Óg (Aengus the Young), Mac ind Óg (son of the young), Maccan or Mac Óg (young son) was a member of the Tuatha Dé Danann and probably a god of love, youth and poetic inspiration. ... The Irish people (Irish: Muintir na hÉireann, na hÉireannaigh, na Gaeil) are a European ethnic group who originated in Ireland, in north western Europe. ... Dis Pater, or Dispater, was a Roman and Celtic god of the underworld, later subsumed by Pluto or Jupiter. ... Map of Gaul circa 58 BC Gaul (Latin: ) was the name given, in ancient times, to the region of Western Europe comprising present-day northern Italy, France, Belgium, western Switzerland and the parts of the Netherlands and Germany on the west bank of the Rhine river. ... Gaius Julius Caesar [1] (Latin pronunciation ; English pronunciation ; July 12 or July 13, 100 BC or 102 BC – March 15, 44 BC), was a Roman military and political leader and one of the most influential men in world history. ...

Originally, Donn was the chief of the Sons of Mil, a mythological race who invaded Ireland, ousting the Tuatha Dé Danann. Donn slighted Ériu, one of the eponymous goddesses of Ireland, and he was drowned off the south-west coast of the island. A place near this spot, on a small rocky island named 'Tech nDuinn'. ('the House of Donn'), became Donn's dwelling place as god of the dead. This house was the assembly place for the dead before they began the journey to the otherworld. “Áes dána” redirects here. ... In Irish mythology, Ériu (), daughter of Ernmas of the Tuatha Dé Danann, was the eponymous patron goddess of Ireland. ... An eponym is a person (real or fictitious) whose name has become identified with a particular object or activity. ... For Irish Mythology, see Other World. ...

In modern Irish, the word for the colour brown is "donn". Brown, when used as a general term, is a color which is a dark orange, red or rose, of very low intensity. ...

References

Dictionary of Celtic Myth and Legend. Miranda Green. Thames and Hudson Ltd. London. 1997