Scottish mythology is the collection of myths that have emerged throughout the history of Scotland, sometimes being elaborated upon by successive generations, and at other times being rejected and replaced by other explanatory narratives. Nature myths The myths and legends of Scotland have a "local colour" as they tell about the way of life during the olden times, apart from giving a perspective of the nature of the country during various seasons of the year. It was the belief that Beira, the Queen of Winter, had a firm hold on the country by raising storms during January and February thus preventing greenery to emerge. She was considered a tough and brutal old woman who stirred the deadly spiraling action of Corryvreckan, ushering snow, as well as torrents resulting in the overflow of rivers. Even the creation of lochs and mountains were attributed to her. Scottish mythology is not like the Greek and Roman myths as it deals with various aspects of nature. In this context the most powerful and feared goddess representing winter is Beira who rules winter for its entire duration. On Beltane she readily concedes to Brighid, who enjoys power until Samhain. This myth is akin to the popular myth of the Mayans and deals with female power in the "creation and the cycle of the year". However, Donald Mackenzie in his book Scottish Wonder Tales from Myth and Legend states that the goddesses of the Scottish myths are not glorified, very much unlike the goddesses of ancient Greece. The rivers in Scotland were considered the dwelling places of goddesses with their characteristic denoting the nature of the river, such as the River Forth being called "deaf or soundless river" on account of its silent flow conditions, and the River Clyde called as "the purifying river" as it caused scouring and cleansing, carrying "mud and clay" during the flood season. Great Mother The Celtic goddesses were authoritative and were associated with female fertility as related to female divinity and earth. In olden times the Celtics land and national societies were both linked with the body of the goddess (also attributed as "tribal goddess") and her representative on earth was the queen. Another "ambivalent" character in Scottish myths was the "hag", the Goddess, the Gaelic Cailleach, and the Giantess, a divine being who is harmful. The hag is also considered a "healer" and helpful during childbirth and is divine