According to legends, Amalberga experienced miraculous events while escaping from Charlemagne, including the healing of her arm after he broke it trying to force her to marry him.

[3] In Williams' study of the historical origins of the patron saints of trauma, they state that Amalberga was famous throughout Western Europe at the time "for her remarkable beauty, nobility and devoutness".

[1] They recount the legend that her reputation attracted the attention of Pepin the Short, who insisted that she marry his son, Charlemagne.

In what Williams calls "an unusual and fortuitous distraction",[1] Charlemagne became involved in a bear hunt that gave Amalberga time to escape.

[6][7] Historian Matthew Hartley states that Charlemagne was unable to move her "owing to a mysterious power that rendered her immovable".

[9] She died in Bilsen on July 10, 772, at the age of 31, and was buried at the church she built in Temse, which was dedicated to the Virgin Mary.

[5] Baring-Gould and Dunbar state that the fishermen of the Scheld River, in honor of the miracle that enabled Amalberga to escape from Charlemagne, offer a sturgeon each year on her feast day to her chapel in Temse.

[9] Dunbar also states that twice during Amalberga's life, she fed people during famine, "on the flesh of large fish which appeared opportunely in the river".

[13] Baring-Gould and Dunbar relate a story about a miraculous fountain; a spring bubbled up in a field near Temse, which the townspeople went to use, destroying the crops there.

According to Dunbar, long after Amalberga's death, a "woman of wicked life", after praying for conversion at the well, was unable to leave the spot, "retaining all her faculties while she kept within a short distance of [the] Well, but becoming paralyzed [when] she attempted to pass that boundary".

[9] She is the patron saint of upper limb injuries, due to the legend about Charlemagne's assault of her, and of Temse, Belgium.