The hatched portion of the map in the northeast excepting the March of the Billungs was the Marca Geronis, notice the Mark Merseburg which was one of its partitions.
The Marca Geronis or March of Gero[1] was a vast super-march in the middle of the tenth century. It was probably created for Thietmar in the 920s and passed consecutively to his two sons, Siegfried and Gero. On Gero's death in 965 it was divided into five different marches: the Nordmark, Ostmark, Meissen, Zeitz, and Merseburg.
Because Siegfried's and Gero's comital seat was Merseburg, it has sometimes been called the March of Merseburg. However, there is also a Merseburger march which grew out of it after 965. Because the central diocese in his march was Magdeburg, it is sometimes called the March of Magdeburg. Other historians prefer to call it the Saxon Eastern March or Ostmark, but these terms are also applied to another march which grew out of it in 965. Because the Marca Geronis was created simultaneously with the March of Billung to the north, it is sometimes said to be the southern half of the Ostmark. Some historians even call it the "March of Meissen."[2] Within the span of one page, James Westfall Thompson refers to it as both the "Sorben Mark" and the "Thuringian March".[3]
Part of the complication involved in ascertaining the territoriality of the march over which Gero ruled is the nature of the margravial title in tenth-century Saxony. It may have signified territorial governance, but on the other hand may have been an honorific for especially powerful counts signifying nothing more than a preeminence in providing defence of the provinces in which were found their counties. It has been suggested that marcher jurisdictions even overlapped within provinces.
In 965, Merseburg became the centre of a smaller, more restricted march belonging to Gunther. On Gunther's death in 982, it was united to the March of Meissen.
The MarcaGeronis or March of Gero was a vast super-march in the middle of the tenth century. It was probably created for Thietmar in the 920s and passed...
alternative name for the Marca Anconetana Marca Arduinica, or march of Turin, founded in 941 and named after Arduin Glaber MarcaGeronis, a tenth-century march...
Polabian Slavs. It arose in 965 in the course of the partition of the vast MarcaGeronis. Ruled by several Saxon margravial dynasties, among them the House of...
Saxony-Anhalt, which he expanded into a vast territory named after him: the marcaGeronis. During the mid-10th century, he was the leader of the Saxon Ostsiedlung...
created out of the division of the vast MarcaGeronis in 965. It initially comprised the northern third of the Marca (roughly corresponding to the modern...
Roman Empire. It was created by Emperor Otto I in the division of the marcaGeronis in 965, following the death of Gero the Great. Its capital was Zeitz...
the Baltic Sea, stretching approximately from Groswin to Schleswig MarcaGeronis (march of Gero), a precursor of the Saxon Eastern March, later divided...
Great Slav Rising in 983, he temporarily reunited all of the southern marcaGeronis under his command. His march included the territory of the Chutizi and...
the Billung March to the north and the MarcaGeronis to the south. After Gero's death in 965, the MarcaGeronis was divided into the Northern March, the...
modern Prenzlau). In 954, Margrave Gero of the Saxon Eastern March (the marcaGeronis), aided by Holy Roman Emperor Otto I's son-in-law, Conrad of Lorraine...
colonisation." This can be contrasted with the military occupation of the MarcaGeronis, the great march of Gero to the south of the Billungs. The Billung March...
Merseburg march was created by Emperor Otto I in the division of the vast MarcaGeronis east of the Elbe and Saale rivers, following the death of Margrave Gero...
the Fowler in his 928/29 Slavic campaign and incorporated into the MarcaGeronis. Henry's successor Otto I in 948 established the Bishopric of Brandenburg...
Slavic tribes up to the Oder river and his son Otto I established the marcaGeronis on their territory, with the government first conferred to the Saxon...
Schauenburg); also ruled a large part of Denmark 1292 – 1340 Gero Ruler of MarcaGeronis, a very large march in Europe 900 – 965 Godfrey I of Louvain Count of...
by the Saxon forces of Margrave Gero and incorporated into his vast MarcaGeronis, while the lands east of the Oder were held by Pomeranian tribes under...
Great created the Billung March, governed by Hermann Billung, and the MarcaGeronis. 937 11 July Rudolph II of Burgundy, the king of Burgundy, died. Rudolph...
the Germans. In the 10th century the march formed part of the vast marcaGeronis from 937 until 965. During this period, the Sorbs were reduced to serfdom...
lands, despite persistent militant struggles, became part of the vast MarcaGeronis under the Saxon margrave Gero and after 965 of the newly established...
the Saale and Bóbr rivers, which about 965 was severed from the vast MarcaGeronis, conquered by the Saxon count Gero in the course of his campaigns against...
was incorporated into the Gau Ciervisti of the Saxon Eastern March (MarcaGeronis) about 937 in the course of the German Ostsiedlung. It is not clear...
Schwabengau from 937. He also ruled in the neighbouring Gau Serimunt of the MarcaGeronis from 945. Like Margrave Gero the Great (c. 900 – 965), he was probably...
of the Meissen margraves, installed by Emperor Otto I when the vast MarcaGeronis (Gero's march) was partitioned into five new margraviates, including...
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