Commentarii de Bello Gallico

Commentarii de Bello Gallico (Classical Latin: [kɔm.mɛnˈtaː.ɾi.iː deː ˈbɛl.loː ˈɡal.lɪ.koː]; English: Commentaries on the Gallic War), also Bellum Gallicum (English: Gallic War), is Julius Caesar's first-hand account of the Gallic Wars, written as a third-person narrative. In it, Caesar describes the battles and intrigues that took place in the nine years he spent fighting the Celtic and Germanic peoples in Gaul who opposed Roman conquest.

Source: Wikipedia — Commentarii de Bello Gallico (CC BY-SA 4.0)