A powerful western European kingdom that grew into the Carolingian Empire.
The Frankish Kingdom was post-Roman Europe's decisive polity: Clovis's Merovingian realm united Gaul under a Catholic (not Arian) dynasty from his baptism at Reims (c. 496–508), and its Carolingian successors — mayors become kings in 751 — built the platform on which Charlemagne's empire and, through partition, France and Germany all stand.
Its medieval bequests are structural: the Franco-papal alliance sealed by Pepin the Short's Donation (756); Charles Martel's victory at the Battle of Tours (732) fixing the Islamic frontier at the Pyrenees; and the Frankish fusion of Roman administration, Germanic kingship, and Latin Christianity that defined "Europe" as a civilisation.
The Franks entered Gaul as Rome's federate soldiers and stayed as its heirs. Clovis (481–511) destroyed the last Roman commander at Soissons (486), the Alemanni, and the Visigoths at Vouillé (507) — and his baptism by Remigius at Reims, with three thousand warriors, married the conquest to Catholic Gaul's bishops and cities: the one barbarian kingdom aligned with its Roman population's faith.
Merovingian custom divided the realm among royal sons — Neustria, Austrasia, Burgundy crystallising as sub-kingdoms — generating the feud-politics Gregory of Tours chronicled (Brunhild and Fredegund's forty-year vendetta the exemplar), while queens, bishops, and the great villa-economy governed between wars. From the mid-seventh century the kings faded to figureheads — the "do-nothing kings" of later propaganda — and the mayors of the palace, above all Austrasia's Arnulfing-Pippinid house, became the realm's real dynasty.
Charles Martel ruled Francia (718–741) without a crown: reunifying the kingdoms from Austrasia, breaking the Umayyad raiding-army between Tours and Poitiers (732), pushing missions (Boniface's) and cavalry-benefices together into the structures later called feudal. His sons finished the logic: Carloman retired to Monte Cassino; Pepin the Short asked Pope Zacharias whether the man with power or the man with title should be king, deposed Childeric III, and was anointed at Soissons (751) — kingship's legitimacy re-founded on the church's oil.
The price and prize was Italy: Pepin crossed the Alps (754, 756) against the Lombards and donated the Exarchate to Saint Peter — the Papal States born as Frankish gift — and the alliance's trajectory ran straight to his son: Charlemagne's Lombard crown (774), Saxon wars, and the imperial coronation of 800 that turned the Frankish kingdom into the Carolingian Empire (treated in its own article).
Frankish government fused inheritances: counts (comites) in Roman civitates, dukes on the marches; the royal court (palatium) itinerating between villas; assemblies of the armed people (the Marchfield, later Mayfield) consenting to war and law; and written codes — Salic law for the Franks, with Roman law running for Romans — under a kingship both war-band lordship and, after 751, sacral office.
Two instruments defined its reach: the church, whose bishops were royal partners, whose monasteries (Luxeuil's Columbanian wave, then Benedictine houses) colonised and archived, and whose synods legislated with the king; and the benefice-vassalage complex — land for mounted service — that Martel's wars accelerated and that would structure European lordship for half a millennium.
Clovis I, 481–511 — Soissons, Vouillé, and the Reims baptism: Gaul united under Catholic Frankish kingship.
Dagobert I, 623–639 — the last commanding Merovingian; Saint-Denis's patron.
Charles Martel, mayor 718–741 — Tours (732); the realm reunified from Austrasia.
Pepin the Short, king 751–768 — the anointed usurper; the Donation of 756.
Charlemagne, king from 768 — the kingdom's transformation into empire.
The conquest sequence built Francia: Soissons (486), Tolbiac against the Alemanni, Vouillé (507) driving the Visigoths to Spain, Burgundy absorbed (534), Provence gained — then centuries of eastern tribute-marches over Thuringians, Bavarians, and Saxons, and the endemic civil wars of the divided realm (Tertry, 687, making the Pippinids masters).
The eighth century's wars were world-historical: Toulouse (721) and Tours (732) checking al-Andalus; Narbonne's recapture (759) expelling Islam from Gaul; the Lombard interventions (754–774); and Aquitaine's brutal pacification — the anvil on which Carolingian military kingship was hammered.