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In page Agnes of Aquitaine, Countess of Savoy:

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Ramiro I of Aragon married a second wife named Agnes, who based on the name is believed to be of Aquitainian origins.[2] The woman's parentage is disputed; she may have been daughter of William VI, Duke of Aquitaine or his half-brother William VII, Duke of Aquitaine. It is believed by some [3] that Duke William VI died childless. Likewise, unlike William VII, he was only step-son of Agnes of Burgundy, Duchess of Aquitaine, and hence less likely to name a daughter for her. On the other hand, any child of Duke William VII would have been no older than about six years old at the time of Ramiro's marriage, which could explain the lack of children born to Ramiro and his second wife.[citation needed]