Some of these books and texts are translations of Celtic legends and sagas; others are retellings of the material, folklore, or literary works based on Celtic themes. During the 19th and early 20th Century there was a resurgence of interest in the folklore of Ireland, Wales and Scotland. This was reflected in a huge amount of literature based on the rich Celtic mythopoetic heritage, most of it very faithful to the original material, some in a more modern voice.