Herstal (ɛʁstal; Hesta), formerly known as Heristal, or Héristal, is a city and municipality of Wallonia located in the province of Liège, Belgium. It lies along the Meuse river. Herstal is included in the "Greater Liège" agglomeration, which counts about 600,000 inhabitants. The municipality consists of the following districts: Herstal, Liers, Milmort, and Vottem. A large armaments factory, the Fabrique Nationale or FN, and the biggest industrial zone of Wallonia (Haut-Sart) provide employment locally. The proximity of the river Meuse and the abundance of local resources attracted settlers in this area since the fifth millennium BC. Around the end of the Roman era and at the beginning of the Merovingian period, the hamlet had become a fortified stronghold. The major road that linked Tongeren to Aachen crossed the Meuse here, where a ferry likely carried travelers to Jupille. The name Herstal is of Franconian origin, consisting of the elements hari ("army") and stal ("resting place", compare "stable") (modern german meaning: Heerstall). The first mention of Herstal is in Latin documents from ±718 (Cheristalius corrected to Charistalius) and 723 (Harastallius). The first possibly non-Latinized occurrences are Eristail (in 919) and Harstail (1197). Pippin of Herstal (ca 635–714), Mayor of the Palace and de facto ruler of Austrasia and Neustria and founder of the family that established the Carolingian dynasty, probably chose this location as his main residence because of its proximity to the major cities of Tongeren, Maastricht, and Liège. Pippin was the father of Charles Martel, victor of the decisive Battle of Tours that stopped the Arab-Muslim advance into northwestern Europe, and great grandfather of Charlemagne, also supposedly born in Herstal. Charlemagne lived for at least fifteen years in Herstal but later established his capital in Aachen, ending Herstal's period of medieval glory as capital of the empire. The town was incorporated into the Duchy of Lower Lotharingia, which became part of the Duchy of Brabant at the end of the 12th century.