Esico of Ballenstedt (died around 1060) is the progenitor of the House of Ascania, (i.e., the oldest known member of his dynasty). Esico was the count of Ballenstedt (r. 1036-1060), and his possessions became the nucleus of the later Principality of Anhalt. Life Parents and siblings Esico is also known as Esiko and Hesicho. His father is sometimes assumed to have been one Adalbert of Ballenstedt, who had married Hidda, a daughter of Margrave Odo I of the Saxon Eastern March, but there is no hard evidence for this. Thereby, Esico would have been a brother of Uta von Ballenstedt, the consort of Margrave Eckard II of Meissen, and of Hacheza, abbess of Gernrode. He may have also had a brother named Dietrich. Career Little is known about him, but he is assumed to have been count of the Saxon Schwabengau, Harzgau and Nordthüringgau with his seat at Ballenstedt Castle. Esico was first mentioned in a 1036 deed issued by Emperor Conrad II, and then until eight further charters issued up to 1059. He is also referred to in the 13th century chronicle, the Annalista Saxo, as Esicus de Ballenstide. He is assumed to have inherited large properties in the Saxon Eastern March from his maternal grandfather Margrave Odo I. He was the count of Ballenstedt from at least about 1036 until his death in about 1060. In about 1043, he likely founded a collegiate church dedicated to Pancras of Rome and Abundius near his castle, castle Ballenstedt. He was among the founders of Naumburg Cathedral, of which his sister, Uta was a major donor. It is occasionally stated that Esico built the first buildings of Anhalt Castle in 1050, but other sources consider that castle to have been built by Esico's grandson, Otto, Count of Ballenstedt, in about 1123. When Uta and Eckard died childless in 1045 and 1046 respectively, their property was to revert to Henry III, Holy Roman Emperor, but Esico ensured that major parts of their inheritance were given to the control of the Gernrode Abby, where their sister, Hazecha, had been abbess since 1043. Esico's possessions became the nucleus of the later Principality of Anhalt. Marriage and Children Esico was married to a woman named Matilda. Following an entry in the Annalista Saxo, Esico is sometimes said to have married Matilda of Swabia, daughter of Herman II of Swabia, and sister-in-law of Emperor Conrad II,