Ellus bas Mordecai (Hebrew: מרת עלוש) was a Jewish woman from Slutsk, then part of the Grand Duchy of Lithuania.
[1][2] The first was an abridged translation of Ma'abar Yabboḳ ("The Ford of the Yabbok") by Aaron Berechiah of Modena, a Kabbalistic text about rituals for the dying and the dead.
The second was a translation of Shomrim la-boker ("Watchers for the Morning"), a sunrise prayer liturgy.
In her introduction to the latter, she writes that she was motivated by the fact that "many men and women chirp like birds" reciting the Hebrew prayers without a full understanding of the language.
[1][2] Ellus was married to Aaron, son of Rabbi Eliakim Goetz Ben Meir, author of Even HaShosham.