Why was the Order of the Garter instituted?
Because of the victory obtained over the French at the battle of Cressy, when Edward ordered his garter to be displayed as a signal of battle; to commemorate which, he made a garter the principal ornament of an order, and a symbol of the indissoluble union of the knights. The order is under the patronage or protection of St. George, whence he figures in its insignia. Such is the account of Camden, Fern, and others. The common story of the order being instituted in honour of a garter of the Countess of Salisbury, which she dropped in dancing, and which was picked up by King Edward, has been denounced as fabulous by our best antiquaries.
Cock-crow.
Why was it formerly supposed that cocks crowed all Christmas-eve?
Because the weather is then usually cloudy and dark (whence "the dark days before Christmas,") and cocks, during such weather, often crow nearly all day and all night. Shakspeare alludes to this superstition in Hamlet—
Some say that even 'gainst that hallow'd season,
At which our Saviour's birth is celebrated,
The Bird of Dawning croweth all night long.