Elfreda ^{1 2 3}

   Other names for Elfreda were Ælfflæd and Elfleda.

  Research Notes:

From Wikipedia - Edward the Elder :

When he became king in 899 , Edward set Ecgwynn aside and married Ælfflæd , a daughter of Æthelhelm, the ealdorman of Wiltshire . [7] Their son was the future king, Ælfweard , and their daughter Eadgyth married Otto I, Holy Roman Emperor . The couples other children included five more daughters: Edgiva aka Edgifu, whose first marriage was to Charles the Simple ; Eadhild, who married Hugh the Great , Duke of Paris; Ælfgifu who married Conrad King of Burgundy; and two nuns Eadflæd and Eadhild. According to the entry on Boleslaus II of Bohemia , the daughter Adiva (referred to in the entry for Eadgyth ) was his wife. A son, Edwin Ætheling who drowned in 933[8] was possibly Ælfflæd's child, but that is not clear.

Elfreda married Edward I "the Elder" King of England, son of Alfred the Great King of Wessex, King of England and Ealhswith of the Gaini, Queen of the Anglo-Saxons, in 899. (Edward I "the Elder" King of England was born between 871 and 875 in Wessex, England, died 17 Jul 924 or 925 in Fardon-on-Dee, Cheshire, England and was buried in New Minster, Winchester, England.)