300 BC — AD 2024

The Borders That Never Moved

How France’s 120 Gallic tribal territories became Roman civitates, then dioceses, then modern departments — a 2,300-year continuity.

Explore the Journey
I

Bellum Gallicum

Caesar’s eight-year conquest of Gaul (58–50 BC), animated across the tribal map. Every battle, siege, and march — frame by frame.

Duration 2:39  ·  Resolution 1920×1080  ·  Events 29 campaigns
Gallic Tribes
Caesar
Civitates
Dioceses
Departments
II

Four Layers of History

Each map represents a distinct era. Hover for detail. Every path is editable SVG with semantic data attributes.

2024 AD

Departments

96 departments · 248 KB · Editable SVG

≈ 300 BC

Gallic Tribes

60 tribal territories · 49 KB · Editable SVG

IV century

Roman Civitates

109 civitates · 80 KB · Editable SVG

Pre-1789

Dioceses

146 dioceses · 104 KB · Editable SVG

III

The Continuity

Superimposing eras reveals the truth: boundaries drawn by Gallic tribes endured through Roman administration, medieval Church, and into the modern Republic.

Overlay

Tribes + Departments

Modern department boundaries mapped onto ancient Gallic territories. The persistence is striking — most tribal edges align with departmental borders to within a few kilometers.

Transformation

Tribes → Civitates

Rome replaced tribal names with Latin ones and tribal chiefs with magistrates, but kept the same territorial divisions almost intact. Each civitas maps to one or more former tribes.

Inheritance

Tribes → Dioceses

When Christianity organized itself, bishops took their seats in the old civitas capitals. Each diocese inherited the boundaries of the Roman unit before it — which inherited from the tribe before that.