Girdle books were small portable books worn by medieval European monks, clergymen and aristocratic nobles as a popular accessory to medieval costume, between the 13th and 16th centuries. They consisted of a book whose leather binding continued loose below the cover of the book in a long tapered tail with a large knot at the end which could be tucked into one's girdle or belt. The knot was usually strips of leather woven together for durability. The book hung upside down and backwards so that when swung upwards it was ready for reading. The books were normally religious: a cleric's daily Office, or for lay persons (especially women) a Book of Hours. One of the best known texts to become a girdle book is Boethius's "The Consolation of Philosophy", although it is the only surviving philosophical/theological girdle book.