The history of Halloween is fascinating - thanks, in large part, to the Irish.

From the system behind bobbing for apples to why we wear orange and black on Halloween, here are 10 of the most interesting Irish facts about Halloween.

Halloween comes from the ancient Irish festival of Samhain, a day when the undead are thought to walk among the living, and we must ward off the evil spirits.

Ward off evil spirits.

Ward off evil spirits.

Samhain marks the end of the long days and the drawing in of winter. In the same way, the Celts celebrated Lughnasa, the festival of the harvest, Samhain represents the beginning of winter, the "darker half" of the year.

Celebrating entering the "darker half" of the year.

Celebrating entering the "darker half" of the year.

An old favorite Irish Halloween game was to blindfold a person and have them place their hands on items spread across a table. Landing in a bowl of water meant emigration, a piece of earth meant a death in the family, a ring meant a wedding was coming soon and so on.

One of the greatest short stories by James Joyce, ‘Clay,’ refers to this custom – the main character, the spinster Maria, wants her hand to land on a ring, but touches a lump of clay instead, which implies death.

James Joyce's famous Halloween tale, Clay.

James Joyce's famous Halloween tale, Clay.

In a similar game, a ring was also hidden in the "Barmbrack," which is a bread-like fruitcake specially made for the occasion. The person who got the ring in their slice – if they didn't swallow it – would have a happy marriage ahead.

Halloween Barmbrack.

Halloween Barmbrack.

The symbolism behind apple seeds, and bobbing for apples, is fertility in the year ahead. The Celts believed that the pentagram shape represented fertility, and when an apple is cut in half, the seeds form a pentagram-like shape. When couples bobbed for apples together on Halloween, if one of them caught one, they would soon be blessed with a child. 

Bobbing for apples.

Bobbing for apples.

In Celtic legend, orange and black, the colors of Halloween, are the colors of death.

Orange and black, the ancient traditional colors of Halloween.

Orange and black, the ancient traditional colors of Halloween.

Because of number 7, meeting an orange-haired woman was considered to be a bad omen, especially for fishermen. Furthermore, legend has it that for a man to meet an orange-haired woman on Halloween was even more dire. He had to turn around and go right back home.

Orange haired women are considered a bad omen at Halloween.

Orange haired women are considered a bad omen at Halloween.

Druids were especially powerful on Halloween when the spirit world and the human world were at their closest. Their visions and predictions were listened to quite closely at this time.

Druids were especially powerful on Halloween.

Druids were especially powerful on Halloween.

The custom of Halloween was brought to America by Irish famine emigrants in the 1840s. The use of pumpkins for Jack-o'-lanterns only started in America, as they are native to the country. Turnips were usually used in Ireland.

Read more: Ancient Irish myths that invoke the spirit of Samhain

* Originally published in October 2010.

Do you know the symbolism behind bobbing for apples? Or why do we wear orange and black on Halloween?Getty