It is located high above the Wangental on a spur of the Rossberg which drops off steeply on three sides in Osterfingen in the municipality of Wilchingen.

A knight "Rudolf nobilis dictus Schade de Radegg" is documented around the year 1225.

The bourgeois family Schad von Radegg settled in Schaffhausen in the Late Middle Ages.

In his Legend of Kätterli, the writer Otto Uehlinger tells of a robber baron many centuries ago who lived with his wife and seven sons in Castle Radegg.

After the death of his kindhearted wife, the knight lost all sense of chivalry and decency.

One of the prisoners, an Italian nobleman, fell in love with Kätterli and, after payment of a high ransom, he was released and asked for her hand in marriage.

A year later, the nobleman allowed Kätterli to bring a blue-flowering rose bush back to Radegg Castle where she planted it.

For this reason, the warlords of Schaffhausen and the peasants of Osterfingen resolved to finally put an end to their lawlessness.

Even today, one can sometimes catch a glimpse of her on moonlit nights sitting atop the ruins of the castle where she prays for the souls of her family and awaits her redemption.

Only a young man beyond reproach who can find one of the blooming blue roses and bring it to Kätterli can release her.