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In page Ealhswith:

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She was married to Alfred in 868 at Gainsborough, Lincolnshire. His elder brother Æthelred was then king, and Alfred was regarded as heir apparent.[1][2] The Danes occupied the Mercian town of Nottingham in that year, and the marriage was probably connected with an alliance between Wessex and Mercia.[3] Alfred became king on his brother's death in 871. Ealhswith is very obscure in contemporary sources. She did not witness any known charters, and Asser did not even mention her name in his life of King Alfred. In accordance with ninth century West Saxon custom, she was not given the title of queen. According to King Alfred, this was because of the infamous conduct of a former queen of Wessex called Eadburh, who had accidentally poisoned her husband.[4]