Sancho IV was born about 0890. He passed away about 0955.
Duc de Gascogne (926-955), Comte d'Agen, Comte de Gascogne (926-955)
List of Dukes of Gascogne: Lop II 768/70-778/801 Probably the founder of a Gascon line of dukes.
Sans I Lop 778/801-812 Son of the predecessor.
Seguin I Lop 812-816 Brother of the predecessor, rebelled against the Franks.
Gassia I Semen 816-818 Son of the predecessor. Rebelled against the Franks.
Lop III Centullo Wasco 818-819/23 Son of the predecessor, or of Centullo, brother of Sans I. Rebelled against the Franks.
After Lop Centullo's death the duchy was divided: the County of Vasconia temporarily segregated from the Duchy.
Duchy, as Frankish vassal: Seguin II Seguin Mostelanicus(819/23-846), son or grandson of
Seguin I, also Count of Bordeaux.
William I of Septimania (846-848 or 852), son of Dhuoda, daughter of Sans I; died with no descendants.
County, as Frankish rebel: Aznar Sans (820-836), son of Sans I, as count of Vasconia.
Sans II (836-855 or 864), fought against the Franks since 848 and eventually became Duke of Vasconia. In 852, Sans II, from the rebel county, eventually reunited Gascony and regained the ducal title.
Sans II Sancion 852-855/64 Son of Aznar Sans, and the new duke from 852.
Arnaut 855/64 Son of Sansa Sancion, daughter of Sans I.
Sans III Sancion the Terrible (Sans Mitarra) 864-893 Son of Sans II.
Gassia II Sans the Bent (Gassia Okerra) 893-930 Son of the predecessor.
Sans IV Gassia 930-c.950 Son of the predecessor.
Sans V Sancion c.950-961 Son of Sans II. Some historians believe his name was instead Gassia.
Guilhem II Sans c.961-996 Brother of the predecessor.
Bernat I Guilhem 996-1009 Son of the predecessor.
Sans VI Guilhem 1009-1032 Brother of the predecessor.
House of Poitiers Eudes (1032–1039)
House of Armagnac Bernat II (1039–1052)
House of Poitiers After 1053, the title of duke of Gascony was held by the dukes of Aquitaine.
Guy Geoffrey (William VIII of Aquitaine) (1052–1086)
William IX of Aquitaine (1086-1126)
William X of Aquitaine (1126-1137)
Eleanor of Aquitaine (1137-1204)
House of Plantagenet After 1204, the title of duke of Gascony was held by the kings of England.
Bulletin By Société des sciences, lettres et arts de Pau
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