Saint Gertrude of Nivelles (also spelled Geretrude, Geretrudis, Gertrud) (ca. 621 – March 17, 659) was a seventh century abbess who, with her mother Itta, founded the monastery of Nivelles in present-day Belgium. While never formally canonized, Pope Clement XII declared her universal feast day to be March 17 in 1677. She is the patron saint of travelers, gardeners and cats, and against rats and mental illness.