The primary source which confirms his parentage has not yet been identified. Esiko's relationship, through his mother, with the Markgrafen der Ostmark is deduced from the Annalista Saxo which names "Sigefridus, avunculus Esici comitis de Ballenstide, filius Odonis incliti marchionis". "Heinricus…rex" donated property "quod comes Hesicho nostre consanguinitati…hereditatis Fulkmeresroth in comitatu eiusdem comitis" to the church of Naumburg by charter dated 27 Jun 1043. The precise relationship between Esiko and Heinrich III King of Germany has not been identified.
Graf im Schwabengau und im Gau Serimunt. He founded the abbey of Ballenstedt. "…Hesicus comes…" witnessed the charter dated 15 Apr 1059 under which Adalbert Archbishop of Hamburg confirmed a donation to Kloster auf dem Sülberge. 1
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