(Yes, I know that leprechauns are all male, but I just have to wonder how more leprechauns would be produced! I personally think that this very strange little female from a 14th-century French illumination (NY, Metropolitan Museum of Art, 68.174, fol. 28v) would be exactly the right companion for any sensible leprechaun!)
And finally, the shamrock, a member of the clover family. This border of shamrocks is adapted from the embroidery on an altar frontal from 13th-century Rupertsberg. The famous apocryphal story about St. Patrick is that he used its three leaves to teach the Irish about the Christian Trinity. An older Druid belief involved finding a four-leaf clover which, they believed, could help in locating witches and demons. The shamrock remains the national emblem of Ireland.