Dentelin was a region of the Frankish Empire

Frankish Empire

Francia or Frankia, later also called the Frankish Empire , Frankish Kingdom , Frankish Realm or occasionally Frankland, was the territory inhabited and ruled by the Franks from the 3rd to the 10th century...

 disputed between Austrasia

Austrasia

Austrasia formed the northeastern portion of the Kingdom of the Merovingian Franks, comprising parts of the territory of present-day eastern France, western Germany, Belgium, Luxembourg and the Netherlands. Metz served as its capital, although some Austrasian kings ruled from Rheims, Trier, and...

 and Neustria

Neustria

The territory of Neustria or Neustrasia, meaning "new [western] land", originated in 511, made up of the regions from Aquitaine to the English Channel, approximating most of the north of present-day France, with Paris and Soissons as its main cities...

.

Mentioned in the Chronicle of Fredegar

Chronicle of Fredegar

The Chronicle of Fredegar is a chronicle that is a primary source of events in Frankish Gaul from 584 to around 641. Later authors continued the history to the coronation of Charlemagne and his brother Carloman on 9 October 768....

, the Duchy

Duchy

A duchy is a territory, fief, or domain ruled by a duke or duchess.Some duchies were sovereign in areas that would become unified realms only during the Modern era . In contrast, others were subordinate districts of those kingdoms that unified either partially or completely during the Medieval era...

 of Dentelin included far north-western parts of modern France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 and south-western parts of Belgium

Belgium

Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

. The cities of Boulogne-sur-Mer

Boulogne-sur-Mer

-Road:* Metropolitan bus services are operated by the TCRB* Coach services to Calais and Dunkerque* A16 motorway-Rail:* The main railway station is Gare de Boulogne-Ville and located in the south of the city....

, Thérouanne

Thérouanne

Thérouanne is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Thérouanne is located 10 miles southwest of Saint-Omer, on the D157 and D341 road junction.-Population:-History:...

, Tournai

Tournai

Tournai is a Walloon city and municipality of Belgium located 85 kilometres southwest of Brussels, on the river Scheldt, in the province of Hainaut....

, Arras

Arras

Arras is the capital of the Pas-de-Calais department in northern France. The historic centre of the Artois region, its local speech is characterized as a Picard dialect...

, and Cambrai

Cambrai

Cambrai is a commune in the Nord department in northern France. It is a sub-prefecture of the department.Cambrai is the seat of an archdiocese whose jurisdiction was immense during the Middle Ages. The territory of the Bishopric of Cambrai, roughly coinciding with the shire of Brabant, included...

 lay within the duchy.

Dentelin formed part of the inheritance of the Merovingian king of Neustria Chlothar II, but was lost by him to his cousins, Theudebert II

Theudebert II

Theudebert II , King of Austrasia , was the son and heir of Childebert II. He received the kingdom of Austrasia plus the cities of Poitiers, Tours, Vellay, Bordeaux, and Châteaudun, as well as the Champagne, the Auvergne, and Transjurane Alemannia, on the death of his father in 595, but was...

 and Theuderic II

Theuderic II

Theuderic II , king of Burgundy and Austrasia , was the second son of Childebert II...

, following the battle of Dormelles

Dormelles

Dormelles is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.-History:Dormelles was the site of a battle circa 599 between rival Merovingian kings. Chlothar II, ruler of Neustria, faced his cousins, Theuderic II, King of Burgundy, and Theudebert II,...

 in 599.

Chlothar, who outlasted his rival kinsmen and became sole Frankish king, retained Dentelin when he installed his son Dagobert I

Dagobert I

Dagobert I was the king of Austrasia , king of all the Franks , and king of Neustria and Burgundy . He was the last Merovingian dynast to wield any real royal power...

as king of Austrasia in 623. When Dagobert died in 639, Dentelin was included in Neustria, and remained part of that kingdom afterwards.