Airmid is the Goddess of Herb-lore and Herbal Healing. She is the daughter of Dian Cecht, the Tuatha De Danaan's head healer. She knows all lore, uses, and properties of every herb. She also guarded - Well.
Ériu is the sovereign Celtic Goddess of Ireland. She is not a ruler or a queen of Ireland but rather she is Ireland or at least the land that makes up Ireland; and, in a sense, she is the heart of Ireland.