During its exisence, it served as a buffer zone between the Western Roman Empire and the Alan Kingdom. The kingdom quickly fragmented following the death of Engilbert and the beginning of the Dertosan Civil War which ended by its annexation by the Alan Kingdom in 458.
The Kingdom was founded following the defeat of Flavius II against the Alan Kingdom during his war in Hispania. Engilbert and his men were promised lands in exchange of there help. Flavius II believed he could give them part of his conquests, but his defeat leaved him with no choice but to give Roman lands to the Franks.
Engilbert ruled the Kingdom with a politic of tolerance toward the Romans and Iberians that lived in his kingdom, and even allowed some Romans to rise as chieftains. On the economic side, however, his realm was isolated; the Romans refusing to help Engilbert in hope he would not be able to rule the lands and return them to the Empire, and the Alans, who considered the Kingdom of Dertosa as an ally of Rome. The only help came from the Suebi Kingdom, which allied itself with Dertosa in hope of slowing or stopping the Alan expansion.
In 431, the Alan King Baluk decided to invade the Kingdom of Dertosa in attempt to get rid of this buffer state between the Alans and the Romans. The Suebi King, Heremigarius, declared war on the Alans to protect his ally. The Second Hispanian War ended two years later with a Suebi-Frankish victory, allowing Dertosa to expand south.
The rest of Engilbert's reign was lived mostly in peace, although he constantly had to protect the political independence of his realm toward the Romans and Alans. The death of Engilbert on the 14 February 451 ended the period of prosperity of the Frankish Kingdom of Dertosa.
Civil War and Annexation
The King is the supreme head of the government and the absolute monarch of Dertosa. His word his mostly law, and his men must obey his will. The King mostly rule from his capital, sending members of his court to deal with problems out of the city.
The King can attribute territories to members of his courts so that they can rule it in his name. The title is supposed to be hereditary, although the King reserve himself the right to take back the lands whenever he want. The first Chieftains, as they are call, were Frankish ooficers that joined Engilbert during the campaign in Hispania. Since then, some Romans and Iberians were able to rise to be Chieftain, which they call Magistrum.
Unlike most Franks in the 5th century, the Dertosan army had a large cavalry, which was mainly organized and formed of local Romans and Iberians. This heritage lead to the rise of new tactics for the Franks, like the heavy use of cavalry charges in battle. Still, the core of the army was made of Frankish infantry.
The Franks lacked good armor, like most barbarian tribes, even with the help of local Dertosan. They also lacked bows in most case, which were only use for defensive purpose. On a battlefield, the standard ranged weapon was a throwing axe. Other standard weapons included a sword and a shield for the infantry, while the cavalry integrated Roman spears to make use of the horses's speed.
The official religion of the Kingdom of Dertosa was Frankish Paganism, which was the faith of Engilbert and the Franks that followed him. In 430, Engilbert and his men finished the construction of the first Frankish temple in the capital of Dertosa.The construction was made possible with the help of Roman architects. It was also the first building of Frankish origin built in the Kingdom (the second being the Royal Palace, built in 433)
The Kingdom of Dertosa allowed its Roman and Iberian citizens to continue the practice of Christianism in the realm. THe Christians were not percecuted or seen as criminal, although Christianity was never officially recognize by the King and his court. Christians gained power over the realm after most Pagans died with Munderic in 455, which was followed by the return of Childebert, who became Christian during his exile.