But to give Kupala and Kostroma a human body again was impossible, so instead they turned them into the flower with yellow and blue petals, in which the fiery-yellow color was the color of Kupalo, and the blue one, like the waters of a forest lake, was the color of Kostroma. The Slavs gave the name Kupalo-da-Mavka to the flower. Later, in the time of the Christianization of Kievan Rus', the flower was renamed to the Ivan-da-Marya[7].