Complety dating in kiev
He dismissed each of the prior theories in turn as insufficiently grounded and incompatible given the historical record, and further argued that many of the proposed solutions would have meant that later documented marriages would have fallen within the prohibited degree of kinship, yet there is no record the issue of consanguinity was ever raised with regard to these marriages.
He argued that the documentary testimony of Agatha's origins is tainted or late, and concurred with Humphreys' evaluation that the names of the children and grandchildren of Agatha, so central to prior reevaluations, may have had non-family origins (for example, Pope Alexander II, having played a critical role in the marriage of Malcolm and Margaret, may have inspired their use of that name).
Later sources of dubious credibility such as the Chronicle of Melrose Abbey call her daughter of Henry, while Matthew of Paris calls her the emperor's sister (soror Henrici imperatoris Romani).
Geoffrey Gaimar in Lestoire des Engles states that she was daughter of the Hungarian king and queen (Li reis sa fille), although he places the marriage at a time when Edward is thought still to have been in Kiev, while Orderic Vitalis in Historiae Ecclesiasticae is more specific, naming her father as king Solomon (filiam Salomonis Regis Hunorum), even though he was actually a contemporary of Agatha's children.
In that year, Jozsef Herzog published an analysis suggesting that Agatha was daughter of one of Henry's half-brothers, born to his mother Gisela of Swabia by her earlier marriages to Ernest I of Swabia and Bruno of Brunswick, probably the former based on more favourable chronology.
Jetté pointed out that William of Malmesbury in De Gestis Regis Anglorum and several later chronicles unambiguously state that Agatha's sister was a Queen of Hungary.
The argumentum ex silentio leads critics of the Kievan theory to search for alternative explanations.
Agatha (before 1030 – after 1070) was the wife of Edward the Exile (heir to the throne of England) and mother of Edgar Ætheling, Saint Margaret of Scotland and Cristina of England.
Her antecedents are unclear and the subject of much speculation.
Likewise, all of the solutions involving Henry II would seem to make Agatha much older than her husband, and prohibitively old at the time of the birth of her last child, Edgar.
Based on a more strict translation of the Latin description used by John of Worcester and others as well as the supposition that Henry III was the Emperor designated in the Anglo-Saxon Chronicle, genealogist Szabolcs de Vajay popularised another idea first suggested in 1939.
William of Malmesbury in De Gestis Regis Anglorum states that Agatha's sister was a Queen of Hungary (reginae sororem) and is echoed in this by Alberic of Trois-Fontaines, while, less precisely, Ailred says of Margaret that she was derived from English and Hungarian royal blood (de semine regio Anglorum et Hungariorum extitit oriunda).