According to the legend, Melusina was the wife of Count Siegfried I. In 963, he built his castle on the Bock promontory, above the Alzette, for his lovely wife, who had laid down two conditions before consenting to the marriage: she wished to be alone every Saturday at noon without being disturbed. Siegfried’s curiosity allegedly led him to observe his wife on a Saturday through the keyhole and discover that her legs were turning into a fishtail. His scream betrayed him and Melusina disappeared in the Alzette. Even today, it is said that she appears every seven years.