Pedantic note: Yes, Meditations (a phisosophical treatise) was written in Koine, Commentarii de Bello Gallico (veni, vedi, vici—self-aggrandizing combat-reports meant for the senate and propaganda) or other "published" works from Caesar were not.

Although bonus points, the ancient sources portray Caesar (a proper educated major family Patrician) as speaking his dying words—if reported saying anything at all—in Greek, not in Latin: "Καὶ σὺ τέκνον" (Even you, child) rendered in Shakespeare as "Et tu, Brute".