Duke Albrecht, the son of Duke Ernst of Würtemberg, made the intimate acquaintance of notoriously beautiful Agnes, born about 1410 in Biberach, but she was a mere servant girl and the daughter of a bath house proprieter. Duke Albrecht courted her and took her with him to his residence in Vohnburg. Albrecht’s father knew about Agnes, but was not concerned until he became anxious about having a legal heir. He wanted his son to marry the daughter of Duke Erich of Braunschweig, but Albrecht refused because of his love for Agnes.

Persuasion was useless, so the Duke resorted to publicly humiliating his son at a tournament when he ordered the judges to refuse admittance to Albrecht on the grounds that his concubine had caused him to neglect his filial duties. Albrecht was furious, and as soon as he returned to Vohnburg he married Agnes. With the consent of his uncle, Duke Wilhelm, he moved his bride to Schloss Straubing as his duchess and surrounded her with a ducal court.

Her happiness was short lived and filled with constant worry, and Agnes even had a premonition of a little chapel being built for her own future crypt. Indeed, while her husband was on a journey in 1435, the Duke took advantage of his son’s absence and had Agnes seized and imprisoned as a witch, her guilt predetermined: she was condemned for bewitching Duke Albrecht and thus vicariously committing a criminal offence against Duke Ernst, who signed the guilty verdict himself.

The judgment ordered her death be drowning in the river. A crowd gathered as the hangmen carried Agnes to the bridge at Straubing. She was thrust into the water and, in a gruesome scene, drifted back ashore because of the strong current. She held up her arms for help, and the people would have saved her had not the hangman grabbed a pole and snarled Agnes’s long hair around it so as to hold her under water until she died. She was buried in St. Peter’s cemetery.

When Albrecht returned and learned of the horrible act, and he swore vengeance. He and his cousin, formed an alliance and began war against his own father. Reconciliation was forced upon them, however, at the council of Basel. After building a chapel over the grave of his beloved, Albrecht obediently married Anna, Princess of Braunschweig and in his sorrow (?) managed to produce ten children with his new wife. In 1447, Duke Albrecht had the body of Agnes transferred to the chapel which she had built for herself and adorned a marble of her with a simple inscription: “Obiit Agnes Bernauerin. Requiescat in pace.”