Patron of the Arts:
Similar to the Roman god Mercury, Lugh was known as a god of both skill and the distribution of talent. There are countless inscriptions and statues dedicated to Lugh, and Julius Caesar himself commented on this god's importance to the Celtic people. Although he was not a war god in the same sense as the Roman Mars, Lugh was considered a warrior because to the Celts, skill on the battlefield was a highly valued ability. In Ireland, which was never invaded by Roman troops, Lugh is called sam ildanach, meaning he was skilled in many arts simultaneously.
Lugh Enters the Hall of Tara:
In one famous legend, Lugh arrives at Tara, the hall of the high kings of Ireland. The guard at the door tells him that only one person will be admitted with a particular skill -- one blacksmith, one wheelwright, one bard, etc. Lugh enumerates all the great things he can do, and each time the guard says, "Sorry, we've already got someone here who can do that." Finally Lugh asks, "Ah, but do you have anyone here who can do them ALL?" At last, Lugh was allowed entrance to Tara.
The Book of Invasions:
Much of the early history of Ireland is recorded in the Book of Invasions, which recounts the many times Ireland was conquered by foreign enemies. According to this chronicle, Lugh was the grandson of one of the Fomorians, a monstrous race that were the enemy of the Tuatha De Danann. Lugh's grandfather, Balor of the Evil Eye, had been told he would be murdered by a grandson, so he imprisoned his only daughter in a cave. One of the Tuatha seduced her, and she gave birth to triplets. Balor drowned two of them, but Lugh survived and was raised by a smith. He later led the Tuatha in battle, and indeed killed Balor.
Julius Caesar believed that most cultures worshipped the same gods and simply called them by different names. In his Gallic War essays, he enumerates the popular deities of the Gauls and refers to them by what he saw as a corresponding Roman name. Thus, references made to Mercury actually are attributed to a god Caesar also calls Lugus -- Lugh. This god's cult was centered in Lugundum, which later became Lyon, France. His festival on August 1 was selected as the day of the Feast of Augustus, by Caesar's successor, Octavian Augustus Caesar, and it was the most important holiday in all of Gaul.
Weapons and War:
Although not specifically a war god, Lugh was known as a skilled warrior. His weapons included a mighty magic spear, which was so bloodthirsty that it often tried to fight without its owner. According to Irish myth, in battle, the spear flashed fire and tore through the enemy ranks unchecked. In parts of Ireland, when a thunderstorm rolls in, the locals say that Lugh and Balor are sparring - thus giving Lugh one more role, as a god of storms.
The Many Aspects of Lugh:
According to Peter Beresford Ellis, the Celts held smithcraft in high regard. War was a way of life, and smiths were considered to have magical gifts -- after all, they were able to master the element of Fire, and mold the metals of the earth using their strength and skill. Yet in Caesar's writings, there are no references to a Celtic equivalent of Vulcan, the Roman smith god.
In early Irish mythology, the smith is called Goibhniu, and is accompanied by two brothers to create a triple god-form. The three craftsmen make weaponry and carry out repairs on Lugh's behalf as the entire host of the Tuatha De Danann prepares for war. In a later Irish tradition, the smith god is seen as a master mason or a great builder. In some legends, Goibhniu is Lugh's uncle who saves him from Balor and the monstrous Formorians.
One God, Many Names
The Celts had many gods and goddesses, due in part to the fact that each tribe had its own patron deities, and within a region there might be gods associated with particular locations or landmarks. For example, a god who watched over a particular river or mountain might only be recognized by the tribes who lived in that area. Lugh was fairly versatile, and was honored nearly universally by the Celts. The Gaulish Lugos is connected to the Irish Lugh, who in turn is connected to the Welsh Llew Llaw Gyffes.
Celebrating the Harvest of Grain
The Book of Invasions tells us that Lugh came to be associated with grain in Celtic mythology after he held an harvest fair in honor of his foster mother, Tailtiu. This day became August 1, and that date ties in with the first grain harvest in agricultural societies in the Northern Hemisphere. In fact, in Irish Gaelic, the word for August is lunasa. Lugh is honored with corn, grains, bread, and other symbols of the harvest. This holiday was called Lughnasadh (pronounced Loo-NA-sah). Later, in Christian England the date was called Lammas, after the Saxon phrase hlaf maesse, or "loaf mass."
An Ancient God for Modern Times
For many Pagans and Wiccans, Lugh is honored as the champion of artistry and skills. Many artisans, musicians, bards, and crafters invoke Lugh when they need assistance with creativity. Today Lugh is still honored at the time of harvest, not only as a god of grain but also as a god of late summer storms.
Even today, in Ireland many people celebrate Lughnasadh with dancing, song, and bonfires. The Catholic church also has set this date aside for a ritual blessing of farmers' fields.