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Gisela was a French princess who was married to Rollo, Duke of Normandy.
According to limited early records, Rollo was betrothed to Gisela, daughter to the king of West Francia, Charles the Simple, after Rollo's conversion to Christianity upon his ascension as ruler of Normandy in 911. The marriage and the existence of Gisela are not independently confirmed, allowing for a legendary character of Gisela. There is some debate whether, if she did exist, she was a legitimate or an illegitimate daughter of Charles.
Norman chronicler William of Jumieges refers to Rollo having two relationships: a captive taken at Bayeux Poppa to whom he joined himself to her by marriage more danico. She was mother of his son William Longsword. He relates that he put Poppa aside to marry Gisela more Cristiano at the time of the Treaty of Saint-Clair-sur-Epte, and that when Gisela died, he returned to Poppa. However, the absence of any record of this royal princess or her marriage in Frankish sources suggests the entire supposed marriage to Gisela may be apocryphal. If Gisela existed and bore Rollo children within a legal Christian marriage, it is unlikely that Poppa's son William would have been seen as legitimate by Christian Franks.
A character named Gisla is portrayed in the TV series Vikings by Morgane Polanski.