The Frankish kingdom was a realm established in Gaul (France) by Merovech, chief of the Salian Franks, which was one of the two branches into which the Frankish tribe was divided. The Franks had conquered the Gauls at the Fall of the Roman Empire, settling there permanently. Merovech was also the founder of the Merovingian dynasty, a sequence of kings that ruled the Frankish kingdom from the 5th century until 751. This ruling house was replaced by the Carolingian dynasty, established by Charles Martel, a mayor of the palace.
At the time of Pepin of Herstal, Charles Martel’s father, the kingdom was divided into three regions ruled by three different Merovingian kings. These were Austrasia, Neustria, and Burgundy. However, these three realms were unified by Pepin, also mayor of the palace and army commander, supporting Childebert III as the only ruling king of the three Frankish regions. Under Charlemagne, the Frankish kingdom would become a large empire, called the Carolingian Empire, which extended from the Pyreenes, in northeastern Spain, to Germany.