Annecy Old Town developed where the short Thiou River carries water from Lake Annecy toward the Fier. Long before the medieval streets appeared, the Roman settlement of Boutae occupied nearby ground. In late antiquity and the early Middle Ages, insecurity and changing routes encouraged habitation to shift toward more defensible positions around the river and the castle hill.

By the twelfth century, the counts of Geneva had established a fortified residence above the town. Annecy grew around bridges, canals, mills, markets, religious houses, and workshops. The Palais de l’Île, built on a rocky island in the Thiou, served at different times as a lordly residence, courthouse, mint, administrative center, and prison. Waterways powered industry and transported waste as well as creating the picturesque setting admired today.

The county of Geneva passed to the House of Savoy in 1401. Annecy became an important regional administrative center for Genevois, Faucigny, and Beaufortain. Fires repeatedly damaged dense timber buildings, leading to rebuilding in stone and plaster. Arcaded streets sheltered trade, while the castle expanded through several architectural phases from the twelfth to sixteenth centuries.

The Protestant Reformation transformed the city’s religious importance. After Geneva adopted reform, its Catholic bishop relocated to Annecy in 1535. The town became a center of the Counter-Reformation. Francis de Sales served as bishop from 1602 to 1622, promoting preaching, education, and new religious communities. Churches, convents, and charitable institutions reshaped the urban fabric and linked Annecy to wider Catholic renewal.

Revolutionary France annexed Savoy in 1792, suppressing or repurposing religious institutions. Control returned to the Kingdom of Sardinia after Napoleon’s defeat, then Savoy was ceded permanently to France in 1860. Nineteenth-century silk manufacture and other industries used the Thiou, while railways, roads, sanitation, and tourism changed relations between the old center and lake.

The Palais de l’Île remained a prison into the nineteenth century and was used again for detention during the Second World War. It was classified as a historic monument in 1900. The city acquired and restored the castle in the twentieth century as a museum. Pedestrianization, façade restoration, and canal management later strengthened tourism. Preserving Annecy Old Town requires balancing residents, markets, businesses, flood control, mobility, and visitors while recognizing that the canals were working infrastructure and the pastel façades reflect centuries of rebuilding rather than an untouched medieval scene.

The old town’s visual unity is partly a modern achievement. Shopfront rules, restoration campaigns, flower displays, and traffic restrictions have emphasized a coherent tourist image, even though the district contains Roman traces, medieval structures, early modern rebuilding, industrial infrastructure, and modern adaptations. Canals require regular cleaning and flood management; historic buildings face damp, fire risk, energy upgrades, and pressure from short-term accommodation. Markets and neighborhood services help keep the center inhabited. Museums at the castle and Palais de l’Île interpret elite government and imprisonment, but domestic houses and former mills reveal equally important labor histories. Annecy’s preservation succeeds when it treats water as working infrastructure and residents as part of the historic place, not scenery around monuments.