The history of the Loiret as an administrative entity began on December 22, 1789, with a decree from the Assemblée Constituante, effective on March 4, 1790. It was formed from parts of the former provinces of Orléanais and Berry.

Evidence of ancient settlement in the Loirétain territory dates to the Palaeolithic era. Romanization after the Gallic War was swift. Around 451, the Huns invaded the region but were repulsed at Orléans. The Franks later reached the Loire, and Clovis, a Christian convert, made Orléans the capital of a Frankish kingdom. Prosperity followed under Charlemagne. Orléans remained a capital until Louis VII.

The Hundred Years' War in the 14th and 15th centuries devastated the countryside, culminating in the siege of Orléans and the victory at Patay, led by Jeanne d'Arc. The 16th century saw an architectural and literary Renaissance but also religious strife, with Orléans as a Protestant stronghold, followed by the St. Bartholomew's Day massacre in 1572. The 17th century brought major infrastructure projects like the Briare and Orléans Canals and Loire levees, followed in the 18th century by the George-V bridge in Orléans. The territory was part of the généralité d’Orléans, established in 1558.

After late 18th-century food shortages, the French Revolution created the department. The 19th century saw political changes and, from the Second Empire, economic growth driven by agriculture—cereals in Beauce, vines in the Loire Valley—and transport developments like the Loire navy and railroads, alongside new industries. World War I and II heavily impacted the Loiret. Post-war reconstruction and the Trente Glorieuses brought growth. However, the early 21st century brought economic challenges.

Prehistory Paleolithic

The earliest human presence in the Loiret dates to the Lower Paleolithic (c. 800,000 to 300,000 years ago), evidenced by Acheulean-style bifaces found in the Loire Valley, particularly on the plateaus of Briare and Gien, and in sand quarries at Châteauneuf-sur-Loire and Saint-Denis-de-l'Hôtel. Similar artifacts were discovered near the Loing River at Nargis and Dordives.

In the Upper Paleolithic, Magdalenian hunter-gatherers settled in the Loing Valley, with key sites at Pierre-aux-Fées and Pâtures Blanches in Cepoy, and Choiseau and Maison Blanche in Fontenay-sur-Loing. The Pierre-aux-Fées site, discovered in 1972 near Montargis, is a significant Magdalenian find for the southern Paris Basin. Notable artifacts include an engraved limestone plaque fragment depicting a horse’s head, indicating horse hunting and artistic skill, possibly linked to ritual practices, though this is unconfirmed.

Neolithic

After the Mesolithic hunter-gatherers at Hauts-de-Lutz in Beaugency, permanent settlement began around 5500 BCE in the Neolithic. Early farmers settled along riverbanks and plateaus, such as at Échilleuses on the Beauce-Gâtinais border and the Vieux Chemin d’Étampes in Pithiviers, among the oldest Neolithic sites in Centre-Val de Loire. Tools and weapons were made from flint and bone, with axe workshops found at Corquilleroy and Fontenay-sur-Loing.

Neolithic burial practices evolved from individual graves, like one at La Chapelle-Saint-Mesmin, to slab-covered tombs at Malesherbes and Orville, cremation sites like the Canas necropolis in Varennes-Changy, and collective burials in dolmens. Numerous megaliths, especially menhirs in the northeast, likely had a cultic purpose, though their exact role is uncertain.

Protohistory Bronze Age

Around the mid-2nd millennium BC, Proto-Celts from Central Europe introduced bronze metallurgy to Gaul. Numerous tumuli attributed to this period appear in Beauce, along the borders of Loiret and Loir-et-Cher, and in the Mauves valleys near Baccon. These are followed around 1200 BCE by the Urnfield culture, known for practicing cremation as a funerary rite. Urns have been found at Tigy, Férolles, Olivet, Baule, and more recently at Courcelles during excavations tied to the A19 autoroute construction. Between Meung-sur-Loire and Saint-Ay, several notable deposits of Late Bronze Age weapons suggest rituals honoring wealthy deceased individuals.

Iron Age

Iron metallurgy emerged in the early 8th century BCE, enabling the forging of larger, sharper tools and weapons. For a time, bronze persisted for weapons and ornamental objects due to the challenges of working iron. While cremation continued, high-status individuals were often buried in tumuli. Several "princely" tumuli have been excavated in Loiret, with the most striking being the Butte des Élus tumulus in Mézières-lez-Cléry, measuring 70 meters in diameter and 12 meters high. Excavations in 1836 and 1857 uncovered folded iron swords, bronze armor fragments, bronze chains, gold jewelry, and a bronze vase. A stone anthropomorphic statue found on the slopes of the Lion-en-Sullias tumulus may represent an ancestor, possibly linked to a cult of the dead. Other notable tumuli include the Butte Moreau in Mardié and one in Sainte-Geneviève-des-Bois.

Rise of Gaulish civilization

During the La Tène (c. 500 BCE), the Gaulish civilization thrived in the Orléanais region, primarily inhabited by the Carnutes, with the Senones in Gâtinais and the Aedui in Giennois. Settlement consisted of isolated farms and, by the early 2nd century BCE, unfortified towns with artisanal activity. Rural dwellings ranged from modest farms to lavish aristocratic residences, as seen at La Pièce de Chameul in Chevilly and Les Pierrières in Batilly-en-Gâtinais, excavated along the A19 autoroute.

Agriculture centered on cereal crops like barley and naked wheat, with emmer and einkorn declining. Millet waned by the end of La Tène, while rare plants like grass pea and woad indicate southern trade. Druids were central to Celtic society, and the Carnutes hosted an annual druidic gathering at a debated “sacred place,” possibly in Loiret near Neuvy-en-Sullias, Bonnée, and Bouzy-la-Forêt, where Gallo-Roman remains, including those at Fleury-sur-Loire (later the Abbey of Saint-Benoît-sur-Loire), were found.

The Carnutes were pivotal in the events leading to Rome’s annexation of Gaul. In 57/56 BC, Julius Caesar imposed Tasgetius, a high-born Carnute, as king, a move resented due to the Gauls’ aversion to kingship in cities.Jacques Debal points out in his book that the only concrete documents on Tasgetius, apart from the mention by Julius Cesar in the Bellum Gallicum, are coins minted with his name. The quotation from Bellum Gallicum is translated by J. Nivet, associate professor at Benjamin-Franklin High School, Orléans. Tasgetius was assassinated in 54 BC, prompting Caesar to send Plancus’s legion to Cenabum (Orléans) to arrest the culprits. On February 13, 52 BC, the Carnutes massacred Roman traders in Cenabum, including Caius Fufius Cita, sparking a wider revolt led by Vercingetorix of the Arvernes, joined by tribes like the Senones and Bituriges. Caesar retaliated, sacking Cenabum, enslaving its inhabitants, and looting the town. After the Gallic defeat at Alesia in 52 BC, the Carnutes were subjugated, and Gaul entered nearly three centuries of Pax Romana.

Antiquity

After Julius Caesar’s departure, Caius Trebonius and two Roman legions governed the devastated Cenabum. In 27 BCE, Augustus integrated the Carnutes’ territory into the province of Lyonnaise, spanning from the Seine to the Loire. Autricum (Chartres) became the political center, while Cenabum (Orléans) served as the economic hub, a key port and bridge at the Loire’s great bend.

Roman administration brought order and expanded communication networks, enhancing Cenabum’s prosperity. Ancient Celtic roads were densified, and in 1936, historian Jacques Soyer documented these in Les Voies antiques de l'Orléanais. Using archaeological finds, medieval records, and archives, he identified sixteen routes from Orléans, six confirmed as Roman-era, connecting to Sens (Agedincum), Pithiviers (Petuarii), Paris (Lutetia), Chartres (Autricum) (two routes), Châteaudun (Dunum), Le Mans (Vindinum) (two routes), Tours (Caesarodunum), Limoges (Augustoritum), Bourges (Avaricum), Sancerre (Gortona or Cortona) (two roads), Autun (Augustodunum) and Auxerre (Autessiodurum). Eleven transverse routes bypassing Cenabum were also noted.

Inland waterway transport on the Loire, managed by the nautae ligerici, was vital. Cenabum’s strategic location—equidistant from the Loire’s source and mouth, at its northernmost point near the Seine—made it a commercial hub even before Caesar’s arrival. Roman traders settled there, and Strabo described it as the Carnutes’ “market.” Cenabum facilitated east-west trade across Gaul, linking Marseille to Armorican ports. The Loire was a key route for merchants sourcing tin from Armorican sailors trading with Britain.

Urban development

After its destruction, Cenabum was rebuilt in the early 1st century, expanding eastward and westward onto former rural land. Buildings adopted Roman-style construction with stone and mortar, featuring baths, hypocaust heating, painted plaster, and mosaic decorations. Cenabum’s monumental ensemble was modest compared to other cities, including a theater at the northern entrance, thermal baths fed by an aqueduct from the Etuvée fountain, a sanctuary for the water goddess Acionna, a forum, and a temple under the modern prefecture. Few remnants survive. The city’s road grid included the north-south cardo (now Rue de la Poterne and Rue Parisie), the east-west decumanus (Rue de Bourgogne), and the road to Bourges (Rue Saint-Marceau).

More significant monumental complexes existed in Gâtinais, Beauce, Loire Valley, and Puisaye. At Triguères, on a former Gallic oppidum, a temple, two spa buildings, and a large amphitheater were built near a venerated menhir. Secondary settlements like Sceaux-du-Gâtinais, listed in the 4th-century Tabula Peutingeriana as Aquae Segeste, thrived in the 1st and 2nd centuries with a temple to the fertility goddess Segeta. Excavations at Le Préau uncovered a marble disc inscribed “AUG-DEA-SEGETAE". At Montbouy, sacred springs supported wells, baths, and a theater-amphitheater at Château de Chenevières, with tiers for up to 6,000 spectators.

Other urban complexes, revealed by aerial surveys and preventive archaeology, include Briare (Brivodurum), Pithiviers-le-Vieil on a major Beauce road, and Beaune-la-Rolande, founded c. AD 50–70 along the Orléans-Sens road.

In rural areas, a dense network of farms and villae covered eastern Beauce and western Gâtinais. These combined agricultural (pars rustica) and residential (pars urbana) functions, with some villae, like the Gallo-Roman villa at Attray (Cul d’Anon site), being notably luxurious.

Gallo-Roman religion

The study of religious practices during the Roman occupation, particularly through treasures found at Neuvy-en-Sullias and Vienne-en-Val, highlights a deep fusion of Gaulish and Roman traditions. On May 27, 1861, a sand quarry in Neuvy-en-Sullias revealed a hoard of about thirty bronze artifacts buried in a 1.40-square-meter pit of bricks, stones, and tiles. Known as the Neuvy-en-Sullias Treasure, it includes animal sculptures, stylized figurines, and statuettes of Roman deities like Bacchus, Mars, and Aesculapius, modeled on Latin prototypes. A prominent horse statue, dated to the early 2nd century BCE, is the centerpiece. Most artifacts date from the 1st century BCE to 1st century CE, though boar figures predate Roman arrival, with the hoard’s burial likely in the 2nd or 3rd century CE.

While the Roman pantheon dominated, indigenous deities were widely worshipped through assimilation with Roman gods, such as Mars-Rudiobus (Neuvy-en-Sullias) and Mars-Mocetius (Orléans). Local tutelary goddesses like Segeta (Sceaux-du-Gâtinais) and Adonna (Orléans) were also revered, often under the patronage of Roman deities, reflecting the elevation of Gaulish goddesses to public city deities.

Barbarian invasions