Kong Renés Datter (King René’s Daughter) is a Danish verse drama written in 1845 by Henrik Hertz. It is a fictional account of the early life of Yolande of Lorraine, daughter of René of Anjou, in which she is depicted as a beautiful blind sixteen-year-old princess who lives in a protected garden paradise. The play was highly popular in the 19th century. It was translated into many languages, copied, parodied and adapted. The Russian adaptation by Vladimir Zotov was used as the basis for the 1892 opera Iolanta, written by Tchaikovsky, with libretto by his brother Modest Ilyich Tchaikovsky. The name of the central character is given as "Iolanthe" in the original and in early English versions. Source: Wikipedia (en)