Ireland's Trees – Myths, Legends & Folklore Name the five Great Trees of Ireland? What trees are most often found beside holy wells or cemeteries? Which tree gave the Red Branch Knights of Ulster their name? Ireland was once so heavily wooded it was said a squirrel could travel from Cork to Killarney without touching the ground. So it is no surprise that, in ancient Ireland, mythology and folklore were a part of the people's general knowledge about trees. Many of the myths and legends and much of the folklore associated with native trees persists to this day and are gathered together in this book.