Saint Gertrude of Nivelles Day is observed on March 17 and honors Saint Gertrude, who was an abbess and co-founder of the Abbey of Nivelles in present-day Belgium. She is recognized as the Patron Saint of travelers, gardeners, widows, recently deceased souls, souls in purgatory, rodents, and cats. The primary source of information about her life is an old French book titled "Vita Sanctae Geretrudis," written by an unknown author. Gertrude was born into a wealthy family and became abbess after her mother, Itta, established the monastery. Her life was marked by charity and care for the sick, elderly, and children, and she is attributed with performing miracles. Following her death, she was canonized by the Roman Catholic Church due to her holy life and the pleasant odor that reportedly filled the room after her passing. In the United States, people may observe this day through religious activities and reflections on her contributions to the community.