One great Celtic short fantasy story is 'The Salmon of Knowledge'. It's a tale full of magic and wisdom. The salmon in the story is a symbol of knowledge and those who seek it go through various adventures.
There is also 'The Wooing of Etain'. This story involves a complex web of love, magic, and reincarnation in the Celtic mythological world. It has elements of otherworldly beings and the power of love that transcends different forms and lifetimes.
One famous short Celtic story is 'The Salmon of Knowledge'. In this story, Fionn Mac Cumhaill sought the wisdom held by the Salmon of Knowledge. After catching and cooking it, he burned his thumb while testing if it was cooked. He put his thumb in his mouth and thus gained the fish's knowledge.
I'd recommend 'The Salmon of Knowledge'. The concept of gaining wisdom through tasting a special fish is easy to understand. And the character of Fionn mac Cumhaill is really interesting. It can be a great introduction to Celtic short stories as it doesn't have overly complex themes or a large number of characters.
Another is the tale of 'Cú Chulainn's Rage'. While not a typical horror story, it has some scary elements. Cú Chulainn was a great Celtic hero. In his 'Rage' mode, he became a terrifying and uncontrollable force. He would transform into a grotesque and fearsome figure, killing many without mercy. His rage was so intense that it was a horror to behold.
One great hounded Celtic fantasy novel is 'The Book of Kells' by R.A. MacAvoy. It weaves together Celtic mythology and magic in a really engaging way.
I would recommend 'The Black Dog of the Fae' which is a lesser - known but very interesting Celtic Fae story. It has elements of horror and mystery. 'The Fae's Gift' is also a good one. It focuses on a human receiving a gift from the Fae and the unforeseen events that unfold. Also, 'The Lady of the Lake', which has strong Fae elements in the Celtic context, is worth reading.
One well - known Celtic love story is the tale of Tristan and Isolde. It's a tragic love story filled with passion and forbidden love. Their love defied the boundaries set by society and politics of the time.
There are many great Celtic mythology stories. For instance, the story of Rhiannon. She was a powerful and beautiful goddess. Her story includes her unjust punishment and her later redemption. Also, the story of Manannán mac Lir, the god of the sea. His tales often involve him protecting sailors and his magical abilities, like his cloak of invisibility. These stories not only entertain but also give insights into Celtic beliefs, values, and culture.
Magic is a very common theme. For example, in many stories there are magical creatures like fairies or druids with special powers.
One great celtic historical fantasy novel is 'The Mists of Avalon' by Marion Zimmer Bradley. It weaves together Arthurian legend with Celtic mythology in a very engaging way.
The 'Sevenwaters' series by Juliet Marillier can also be considered. It often features elements related to prophecy and is deeply rooted in Celtic mythology. There are strong family ties and the characters are often part of a greater destiny as if they were children of prophecy in their own right. The detailed descriptions of the Celtic - like landscapes and cultures make it a great read for those interested in this genre.