Erentrude (also known as Ehrentraud, Erendrudis, Erentruy, Erndrude, Arentruda, Ariotruda and Arndruda) was a saint and abbess, born during the end of the 7th century, probably in present-day Germany or Austria.

She left her home country to assist Rupert in establishing religious communities in Salzburg; in about 700, he built a convent, Nonnberg Abbey, and installed her as its first abbess.

[3] The duchess Regintrudis, wife of Thedo and a Franconian princess, was a nun at Nonnberg Abbey, the convent where Erentrude was abbess, and might have been related to her.

[5] The first biographical sketch about her was written by Caesarius, a chaplain at Nonnberg Abbey at the beginning of the 14th century, at the direction of the bishop at the time; his sources were the oldest nuns at the convent and the people in the area.

According to writer Linda Kulzer, Caesarius "sketches a thoroughly loving and attractive image of Erentrude ... which is the foundation of what is now the common office of the saint".

[7] Rupert, after preaching and founding churches for several years in Bavaria, returned to his home town of Worms, where Erentrude was serving as an abbess, to elicit assistance in his work from "devoted men and women".

[12] In the 11th century, Emperor Henry II rebuilt the church and convent at Nonnberg, which had been burned down and plundered, as a "thank offering"[13] for a cure from leprosy, which he attributed to Erentrude's intercession.

To the astonishment of everyone present, he was immediately struck blind; when he admitted his theft, he promised to resign as abbot and live the rest of his life as a hermit on a nearby mountain.

According to legend, when he died, his body was supposed to be transferred to St. Peter's for burial, but the animals used for transport, "driven by a secret power",[13] went to Nonnberg instead, and he was buried at the church there, near Erentrude.

A lock of blonde hair was found, which, according to an expert, Dr. Hella Pock of Vienna, could not belong to a person of southern or central Germany.