Isembard redirects here. For the engineer, see Isambard Kingdom Brunel

Isambard Kingdom Brunel

Isambard Kingdom Brunel, FRS , was a British civil engineer who built bridges and dockyards including the construction of the first major British railway, the Great Western Railway; a series of steamships, including the first propeller-driven transatlantic steamship; and numerous important bridges...

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Isembart or Isembard was the count of Barcelona, Empúries

County of Empúries

The County of Empúries was a medieval county centred on the town of Empúries and enclosing the Catalan region of Peralada. It corresponds to the historic comarca of Empordà....

, and Roussillon and margrave

Margrave

A margrave or margravine was a medieval hereditary nobleman with military responsibilities in a border province of a kingdom. Border provinces usually had more exposure to military incursions from the outside, compared to interior provinces, and thus a margrave usually had larger and more active...

 of Septimania

Septimania

Septimania was the western region of the Roman province of Gallia Narbonensis that passed under the control of the Visigoths in 462, when Septimania was ceded to their king, Theodoric II. Under the Visigoths it was known as simply Gallia or Narbonensis. It corresponded roughly with the modern...

 together with Aleran

Aleran

Aleran was the Count of Barcelona from 848 to 852. He was also Count of Ampurias and Roussillon and Margrave of Septimania together with Isembart from 849 or 850 to 852.He was a Frankish nobleman loyal to the Emperor...

 from 849 or 850 to 852.

He was the son of Garí of Burgundy, count of Autun

Autun

Autun is a commune in the Saône-et-Loire department in Burgundy in eastern France. It was founded during the early Roman Empire as Augustodunum. Autun marks the easternmost extent of the Umayyad campaign in Europe.-Early history:...

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He was named at the assembly of Narbonne

Narbonne

Narbonne is a commune in southern France in the Languedoc-Roussillon region. It lies from Paris in the Aude department, of which it is a sub-prefecture. Once a prosperous port, it is now located about from the shores of the Mediterranean Sea...

 in 849. He fought, with Aleran, against William, son of Bernat of Septimania

Bernat of Septimania

Bernard of Septimania , son of William of Gellone, was the Frankish Duke of Septimania and Count of Barcelona from 826 to 832 and again from 835 to his execution. He was also count of Carcassonne from 837. He was appointed to succeed his fellow Frank Rampon...

, to consolidate the territory for the Empire

Holy Roman Empire

The Holy Roman Empire was a realm that existed from 962 to 1806 in Central Europe.It was ruled by the Holy Roman Emperor. Its character changed during the Middle Ages and the Early Modern period, when the power of the emperor gradually weakened in favour of the princes...

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In 851 or 852, Aleran died and he began reigning alone until the appointment of Odalric within a year.