Baring-Gould’s sources: Cologne Kalendar, and additions to Usuardus. Commemorated with special office at Villich on the Rhine, opposite Bonn. She is variously called Adelheid, Alkeid, Adelaide, Alheidis, and Aleidis. Her local name at Villich is S. Alen. Her life was written by a contemporary, one Bertha, a nun in her convent.

This holy virgin was the daughter of a Count Megingand of Gueldres, and became abbess of the convent of Villich, founded by her father and mother. Her piety, charity, and gravity are celebrated by Bertha, the nun who wrote her life. She died in 1015. The church and nunnery were burnt in the war between Truchsess Gerhard, the apostate archbishop of Cologne, and the archduke Ernest of Bavaria, and again by the Swedes in the Thirty years' war. It is not known what has become of her relics [the bodily remains of a saint, or objects they used, kept with honor].