In Irish, the name of the Sun, "Grian", is feminine. The figure known as Áine is generally assumed to have been either synonymous with her, or her sister, assuming the role of Summer Sun while Grian was the Winter Sun. Similarly, Étaín has at times been considered to be another theonym associated with the Sun; if this is the case, then the pan-Celtic Epona might also have been originally solar in nature, though Roman syncretism pushed her towards a lunar role.