Mother Winter

Mother Winter is a faerie of the Winter Court. She first appears in Summer Knight.

Description
Mother Winter, occasionally known as Athropos or Skuld, is the Queen that Was. She is the mother of Winter Queen Mab and grandmother of Winter Lady Maeve.

She is described as having withered lips peeled back from iron teeth.

Provided with intellectus, she is one of the the most powerful Fae —her power is an order of magnitude greater than Mab's, just as Mab's is greater than that of the Winter Lady. Since Mab's power normally equals that of Titania,  and each is more powerful than any other in her court, by implication, Mother Winter's power is equaled only by her Summer counterpart.

She is the original Winter Mother, though the current Mother Summer is the second to hold that position.

Mother Summer hints that she and Mother Winter share their most powerful mask, referring to it as "our most powerful name."

Summer Knight
In Summer Knight, she gave Harry threads of Unraveling to undo Aurora's spell on Lily.

Cold Days
In Cold Days, when Harry Dresden summons her to learn about the exact relationship between Mab and Maeve, she feels insulted and attacks him with a cleaver, which prompts Dresden to refer to her as Granny Cleaver. According to Mother Summer she reacted this way because she lost her walking stick and finds it painful to travel without it.