Lugh
Lugh is a major figure in Irish and broader Celtic mythology, known as a sun god, a skilled craftsman, and a powerful warrior. He is also associated with light, justice, and craftsmanship. Lugh is often depicted with epithets like "Lugh Lámfada" (long-armed) and "Lugh Samildánach" (skilled in all arts).
Lugh possesses a magical spear and a sling stone, and he is also known to have invented fidchell (a form of dice game), ball games, and horse racing. The Roman god Mercury was identified with Lugh, reflecting his role as a messenger and a god of commerce and skill.
Lugh is typically described as a youthful warrior. In the brief narrative Baile in Scáil, Lugh is described as being very large and very beautiful and a spear-wielding horseman. When he appears before the wounded Cú Chulainn in the Táin Bó Cúalnge he is described as follows:
A man fair and tall, with a great head of curly yellow hair. He has a green mantle wrapped about him and a brooch of white silver in the mantle over his breast. Next to his white skin, he wears a tunic of royal satin with red-gold insertion reaching to his knees. He carries a black shield with a hard boss of white-bronze. In his hand a five-pointed spear and next to it a forked javelin. Wonderful is the play and sport and diversion that he makes (with these weapons). But none accosts him and he accosts none as if no one could see him
Lugh's horse and magic boat
Lugh had a horse named Aenbharr which could fare over both land and sea. Like much of his equipment, it was furnished to him by the sea god Manannán mac Lir. When the Children of Tuireann asked to borrow this horse, Lugh begrudged them, saying it would not be proper to make a loan of a loan. Consequently, Lugh was unable to refuse their request to use Lugh's currach (coracle) or boat, the "Wave-Sweeper" (Irish: Sguaba Tuinne).
Etymology
The meaning of Lugh's name is still a matter of debate. Some scholars propose that it derives from a suggested Proto-Indo-European root *(h2)lewgh- meaning "to bind by oath" (compare Old Irish luige and Welsh llw, both meaning "oath, vow, act of swearing" and derived from a suffixed Proto-Celtic form, *lugiyo-, "oath"), suggesting that he was originally a god of oaths and sworn contracts. When Balor meets Lugh in the Second Battle of Moytura he calls Lugh a "babbler".
In the past his name was generally believed to come from another suggested Proto-Indo-European root *leuk-, "flashing light", and since the Victorian era he has often been considered a sun god, similar to the Greco-Roman Apollo. However, the figure of Lugh in Irish mythology and literature seems to be a better match with a romanized god identified with Mercury, described by Julius Caesar in his De Bello Gallico.
Toponymy
The County of Louth in Ireland is named after the village of Louth, which is named after the god Lugh. Historically, the place name has had various spellings; "Lugmad", "Lughmhaigh", and "Lughmhadh" (see Historic Names List, for full listing). Lú is the modern simplified spelling. Other places named for Lugh include the cairn at Seelewey (Suidhe Lughaidh, or Lug's Seat), Dunlewey, and Rath-Lugaidh in Carney, Sligo. Seelewey was located in Moyturra Chonlainn and, according to local folklore, was a place where giants used to gather in olden days.
The modern city of Lyon was founded as Colonia Copia Felix Munatia in 43 BC. By the end of the first century AD it was known as "Lugdunum", a Latinized variant of the ancient Gaulish name *Lugudunon, meaning "Fortress of Lugh".
One of the four regions in Galicia is called Lugo, in honour of this god. <https://en.wikipedia.org/wiki/Lugh Lugh]</ref>