One of the theories I explore addresses the question: why are these two Munster-Mórrígna found in seasonal *triples* celebrating #imbolc, #Bealtaine, and #Lughnasa, but not #Samhain? And the answer, I think, is that in these guises they represented stages of the Corn: Planting, Ripening, and Harvest.

That leaves one season and one goddess, but we already have a good idea: the last sheaf of the corn was woven and kept respectfully for next year, and called the #Cailleach - the same name as the goddess of Winter.

That seems to put the Mórrígan in the position of being the representation of the "Maturing/Ripening" stage of the Corn. Planting should be done by Bealtaine! Planting is Brighid's business! :)