Gertrude of Aldenberg
Gertrude of Aldenberg, O.Praem., (c. October 1227 – 13 August 1297) was the daughter of St. Elizabeth of Hungary, T.O.S.F., and of Louis IV, Landgrave of Thuringia. She became a Premonstratensian canoness regular at the Abbey of Aldenberg, near Wetzlar, in the Diocese of Trier, where she spent much of her life leading the community as its abbess. She is honored as a "blessed" of the Order, on Aug. 13. 
Gertrude was the youngest of Louis and Elizabeth's three children. Her father died while on his way to the Holy Land, shortly before she was born. Gertrude was scarcely two years old when her mother left her in the care of the canonesses of the Abbey of Aldenberg, where she later entered the community. In 1248, only 21 years old, she was elected abbess and ruled over the monastery for the next 49 years.
With an inheritance she received from her uncle, Dietrich I, Margrave of Meissen, Gertrude erected a church and a poorhouse attached to the abbey. She took personal care of the residents there. She also led a life of extreme mortification. When Pope Nicholas IV published a crusade against the Saracens, Gertrude and her community took the Crusaders' cross and undertook to support the effort by prayer and acts of sacrifice.
In 1270, under Gertrude's direction, the abbey began to celebrate the Feast of Corpus Christi, being one of the first to introduce this feast into Germany. Pope Clement VI permitted the abbey to celebrate her feast day and granted indulgences to those who venerated her relics.
- "Bl. Gertrude (August 13)", Premonstratensian Perpetual Calendar of Order Saints and Blesseds
- Ott, Michael. "Blessed Gertrude of Aldenberg." The Catholic Encyclopedia. Vol. 6. New York: Robert Appleton Company, 1909. 13 April 2019 This article incorporates text from this source, which is in the public domain.
- Forbes comte de Montalembert, Charles. The Life of Saint Elizabeth of Hungary, Duchess of Thuringia, James Duffy, 1848, p. 268