Libuše, Libussa or, historically Lubossa, is a legendary ancestor of the Přemyslid dynasty and the Czech people as whole. Libuše was the wisest of the three sisters and prophesied the foundation of Prague (which in Czech means: "threshold") from her castle Libušín (according to later legends, Vyšehrad). She is supposed to have founded the city of Prague during the 8th century.

Libuše is said to have been the daughter of the equally mythical Czech ruler Krok, and the youngest sister among his other daughters, the healer Kazi and the magician Teta. She was chosen by her father as his successor (a judge). Although she proved herself as a wise chieftain, the male part of the tribe was displeased that their ruler was a woman.

They asked Libuše to choose a male prince for the people, and she related a vision wherein she saw a farmer with one broken sandal, ploughing a field. She instructed her councilmen to seek out this man, noting that they would find him ploughing a field. Their search let them to Přemysl from the village of Stadice, who was found exactly as had been foreseen.