Patricia was born to House Arundel, at the time a minor house, and is the younger sister of Volkhard. She met her future husband while the latter was visiting the Garreg Mach Monastery and had gone to the Tower of the Goddess, she had just joined the Officers Academy. Her marriage to Emperor Ionius IX raised her house to significantly higher social standing within the Empire. Edelgard was born in Imperial Year 1162. In Imperial Year 1171, when Edelgard was 9, her brother, along with some other nobles, instigated a coup against the Emperor known as the Insurrection of the Seven. During the incident, she and Edelgard relocated to the Holy Kingdom of Faerghus, where she married King Lambert, becoming his second wife and Dimitri's stepmother. Patricia lovingly raised her stepson as her own but never mentioned having any children, causing Dimitri to only meet Edelgard in the last year of her exile. Though Edelgard eventually returned to the Empire in Imperial Year 1174, Patricia remained in Faerghus as its Queen Consort until her death during the Tragedy of Duscur in Imperial Year 1176.
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Though it was long believed that Patricia was another one of the Tragedy's victims, Rodrigue voices his doubts about the situation to Gilbert in the Azure Moon (Dimitri's) route. Patricia had, in truth, completely disappeared during the Tragedy of Duscur, with no evidence that her carriage was ever attacked. She never resurfaced afterwards, not as a political hostage or after her daughter's ascension to the throne, suggesting that she was not kidnapped and held against her will. With this in mind, the two begin to consider the possibility that Patricia was in league with the true culprits behind the Tragedy.
Cornelia, with her dying words, confirms these suspicions, claiming that Patricia was so desperate to reunite with her daughter, she'd do anything to see her again—including killing the king and his family. She further taunts Dimitri, saying Patricia never truly loved him. He initially disregards her words, but they are further cemented when a man involved with the Tragedy confesses that they had specific orders to avoid Patricia's carriage.
Her whereabouts after the Tragedy are never revealed. However, the involvement of Those Who Slither in the Dark with the Tragedy—and her brother Volkhard's true identity as Thales—suggests she was taken away by them.
Patricia is a common female given name of Latin origin. Derived from the Latin word patrician, meaning "noble", it is the feminine form of the masculine given name Patrick.