Why did the societies of Antiquity and the early Middle Ages regard the color blue with complete indifference? Why, starting in the 12th century, does it gradually gain popularity in all areas of life, and why do blue tones in clothing and everyday culture become desirable and prestigious—significantly surpassing green and red? A study by a French historian is devoted to understanding the history of Europeans’ relationship with the color blue, which holds many riddles and unexpected turns. From this book, the reader will learn which social, moral, artistic, and religious values were associated with blue at different times—and what its future prospects are.