Gisela of France
Gisela (; fl. 911, possibly also Gisla) was a French princess who was married to Rollo, Duke of Normandy. It is uncertain whether Gisela existed. Family
According to limited early records, Gisela was a daughter of the king of West Francia, Charles the Simple. There is some debate about whether she existed, and if she did, and whether she was a legitimate or illegitimate daughter of Charles. Marriage 
The first mention of her is when she was betrothed to Rollo after the Siege of Chartres in 911. When Rollo was defeated, he agreed to the Treaty of Saint-Clair-sur-Epte, in which he was created the first Duke of Normandy, swore fealty to Charles, agreed to convert to Christianity, and married Gisela. The marriage of Gisela – and indeed, her existence – lack independent confirmation, suggesting she may be legendary. Norman chronicler William of Jumièges refers to Rollo having two relationships: a captive taken at Bayeux, Poppa, to whom he joined himself by marriage more danico ("according to Norse custom"). Poppa was mother of Rollo's son William Longsword. He describes that Rollo put Poppa aside to marry Gisela more Cristiano ("according to Christian custom") at the time of the Treaty of Saint-Clair-sur-Epte, and that when Gisela died, he re-married Poppa, perhaps around 917. However, the absence of any record of this royal princess or her marriage in Frankish sources suggests the marriage to Gisela may be apocryphal. It is reasonably certain that Gisela had no son. 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. In popular culture 
A character named Gisla (presented as a daughter of Charles the Bald rather than his grandson Charles the Simple, and as the mother of Rollo's children) is portrayed in the TV series Vikings by Morgane Polanski. Notes

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10th-century French people
10th-century French women
10th-century Normans
10th-century Norman women
Carolingian dynasty
Duchesses of Normandy
People whose existence is disputed
Rollo
Year of birth unknown
Year of death unknown
Legendary French people
Daughters of kings