Tyr ( or Tiw) was the god of single combat, law and justice in Norse mythology. And our Tuesday is named after him. This Norse god was immensely brave and he is often associated with Mars, the Roman god of war. In Latin countries Tuesday are named for Mars – hence Mardi in French. In the Greek world, Tuesday (the day of the week of the Fall of Constantinople) is considered an unlucky day.
Tyr had only one hand. He was the god brave enough to put a leash on the gruesome Fenrir wolf. That was how he lost his hand. Only Tyr could feed Fenrir by hand when the wolf was young. After the Norn sisters prophesied that the Fenrir Wolf would start Ragnarok – the twilight of the Norse gods – Odin, the father of Tyr, was saddened. So, the gods wished to put a leash on Fenrir to control him. Tyr put his hand into the wolf’s mouth to keep him quiet, while the others put on the leash. But Tyr didn’t remove his hand quickly enough. When Fenrir realised he was bound he bit down hard. At Ragnarok, the legend says, Fenrir broke free and did indeed swallow Odin.
Other mythical deities associated with Tuesdays include Ares, the Morrighan, and other gods of battle and glory. In ancient lore, red gemstones like rubies and garnets come into play on Tuesdays, as do herbs and plants such as thistles, holly, coneflowers, and cactus. You’ll notice there are all sharp, prickly plants! But it is interesting that Tuesdays are also associated with marriage.