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Gunther was the Margrave of Merseburg from 965 until his death, upon which the march of Merseburg was united to that of Meissen.
Gunther was a scion of the Ekkeharding noble family first recorded around Naumburg, which may be affiliated with the Ottonian dynasty. In 962, he was already regarded as a margrave in the newly created Diocese of Magdeburg, alongside Count Wigger of Bilstein and Wigbert.
He was appointed to the newly created Merseburger march by Emperor Otto I following the death of Margrave Gero the Great in 965, after which the Marca Geronis was split in several smaller parts. The establishment of the march was followed by the Merseburg diocese under Bishop Boso in 968.
Gunther supported Duke Henry II the Quarrelsome of Bavaria in his revolt against Emperor Otto II and was therefore deposed as margrave and banished in 976, while his march fell to Thietmar of Meissen. Gunther nevertheless became reconciled with Otto II and after Thietmar's death in 979 was reinstalled as margrave.