Esiko, Count of Ballenstedt

Esico of Ballenstedt
Coat of arms of the Counts of Ballenstedt
Spouse(s)	Matilda of Swabia
Issue Adalbert II, Count of Ballenstedt
Noble family	House of Ascania
Father	Adalbert of Ballenstedt (?)
Mother	Hidda (?)
Died	c. 1060

Esico of Ballenstedt (died around 1060) is the progenitor of the House of Ascania, i.e., the oldest known member of the dynasty, and during his life was the count of Ballenstedt. Esico's possessions became the nucleus of the later Principality of Anhalt.

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 Hazecha, abbess of Gernrode. He may have also had a brother named Dietrich.

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 also appeared in the 12th century chronicle of Annalista Saxo. 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. He successfully increased his property by marrying Matilda (988/89–1032), a daughter of Duke Herman II of Swabia and sister-in-law of the emperor.

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.