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Donald Charles Jackman (born London, 15 January 1954, died State College, 14 January 2023) was an American medievalist and linguist of Australian background.
Donald C. Jackman received his Ph.D. in 1987 from Columbia University with the dissertation entitled The Konradiner: a study in genealogical methodology dealing with the family of the Conradines. He also later earned the M.A. in applied linguistics and worked as a linguistic supervisor for several years at the Pennsylvania State University. As a historian he concentrated especially on the heritability principle as long-time critic of Eduard Hlawitschka and defender of the thesis of Armin Wolf concerning the genesis of the imperial college of electors. In 2006 he founded the internet publishing house Editions Enlaplage, originally as a conduit for extended investigations into inherited right in the aristocracy of the central Middle Ages.
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William I, called the Great, was Count of Burgundy from 1057 to 1087 and Mâcon from 1078 to 1087. He was a son of Renaud I and Alice of Normandy, daughter of Richard II, Duke of Normandy. William was the father of several notable children, including Pope Callixtus II.
Conrad I was Duke of Swabia from 983 until 997. His appointment as duke marked the return of Conradine rule over Swabia for the first time since 948.
Henry was the leading military commander of the last years of the Carolingian Empire. He was commander-in-chief under Kings Louis the Younger and Charles the Fat. His early career was mostly restricted to East Francia, his homeland, but after Charles inherited West Francia in 884 he was increasingly active there. During his time, raids by the Vikings peaked in Francia. The sources describe at least eight separate campaigns waged by Henry against the Vikings, most of them successful.
OdoI was the Count of Troyes from 852 to 859 and Count of Châteaudun through 871.
Christian Settipani is a French genealogist, historian and IT professional, currently working as the Technical Director of a company in Paris.
Dr Katharine Stephanie Benedicta Keats-Rohan is a British history researcher, specialising in prosopography. She has produced seminal work on early European history, and collaborated with, among others, Christian Settipani. Keats-Rohan is widely regarded as one of the founders of modern prosopographical and network analysis research, which has become highly computer-dependent.
Adalard, also known as Adalhard or Alard, and called the Seneschal, was a Frankish nobleman of the 9th century. He served as warden of the Norman march from 861 to 865, and was Lord Chancellor of France under Louis the Pious.
Berengar I was a 9th-century nobleman of East Francia, a son of Gebhard, Count of Lahngau, and younger brother of Udo. He and his brother were created Margraves of Neustria by Charles the Bald in 861.
Udo was a 9th-century nobleman of East Francia, a son of Gebhard, Count of Lahngau, and older brother of Berengar I of Neustria. He and his brother were afforded their position in the March of Neustria both by kinship to Adalard the Seneschal and the favour of Charles the Bald.
Adalelm was the Count of Troyes from 886 to his death. He was a son of Emenon, Count of Poitou, and a Robertian.
Robert I, called Porte-carquois, was the Count of Troyes. He was a son of Odo I, Count of Troyes, and Wandilmodis.
Ragenold was the Count of Herbauges from 852 and Count of Maine and Margrave of Neustria from 878. His family is unidentified, but he may have been a son of Reginald of Herbauges.
Saint Beuve and her brother Balderic lived in the 7th century in France. According to Christian Settipani, their father was probably Sigobert the Lame, King of Cologne, rather than Sigebert I of Austrasia, as indicated by Flodoard. Together they founded the Abbey of Saint Pierre de Reims. Beuve was the first abbess.
Ferreolus, also called Ferreolus of Rodez was a Gallo-Roman senator from Narbonne, then Narbo, who later lived in Rodez where his family had also held Trevidos, a villa estate near Segodunum, since the mid-fifth century at least.
Ebles I of Roucy was count of Roucy from 1000 to 1033 and archbishop of Reims from 1021 to 1033.
Manasses III, Count of Rethel was a son of Manasses II and his wife Dada. He succeeded his father as Count of Rethel in 1032.
Manasses II, Count of Rethel was a son of Manasses of Omont and his wife, Castricia. He manifested himself in the early 11th century as Count of Rethel.
Hugues du Perche was a 10th-century French noble. He was the youngest son of Fulcois, the Count of Perche, probably of the family of viscounts from Châteaudun, and his wife, Melisende. He was also one of the first known ancestors in male line of the Plantagenets.
Gilbert, Count of Reims & Roucy, was the son of Renaud, Count of Reims and Alberade of Lorraine, daughter of Gilbert, Duke of Lorraine. Although his wife's name is unknown, she was likely from the family of the Poitiers. He was Count of Roucy from 967 until his death, and Viscount of Reims.
Geoffrey I(Gauzfred I) (d. after 985), Viscount of Châteaudun, possibly the son of Geoffroy, Viscount of Chartres. Geoffrey was appointed viscount by Theobald the Trickster, in his position of Count of Châteaudun. Geoffrey was the founder of the House of Châteaudun, which gave rise to both the House of Ingelger and House of Plantagenets. It is believed, but unverified, that Geoffrey descended from Rorgon I, Count of Maine, and therefore part of the Rogonid/Rorgonid dynasty. Little is known about Geoffrey, other than he was closely associated with Hardouin, Archbishop of Tours.
