Below is a list of philosophical writings from Ancient Rome!
Cicero
On the Republic (c. 54 - 51 BCE)
On Duties (c. 44 BCE)
On Divination (c. 44 BCE)
Dionysius of Halicarnassus
On the Admirable Style of Demosthenes (c. 30 BCE)
The Arrangement of Words (c. 30 BCE)
On the Character of Thucydides (c. 30 BCE)
The Art of Rhetoric (c. 30 - 7 BCE)
Commentaries on the Attic Orators (c. 20 - 7 BCE)
On Imitation (c. 20 - 7 BCE)
Plutarch
Moralia (90 - 120 CE)
Quintillian
Institutio Oratoria (c. 95 - 100 CE)
Epictitus
Enchiridion (c. 108 - 120 CE)
Arrian
Discourses of Epictitus (c. 108 - 130 CE)
Aulus Gellius
Attic Nights (c. 150 - 180 CE)
Marcus Aurelius
The Meditations (c. 170 - 180 CE)
Clement of Alexandria
The Protrepticus (c. 190 - 200 CE)
Paedagogus (c. 200 - 205 CE)
The Stromata (c. 200 - 215 CE)
Sextus Empiricus
Outlines of Pyrrhonism (c. 200 CE)
Against the Mathematicians or Against the Professors (c. 200 CE)
Philostratus
Epistolae (c. 220 - 230 CE)
Gymnasticus (c. 220 - 230 CE)
Heroicus (c. 220 - 230 CE)
Life of Apollonius of Tyana (c. 220 - 230 CE)
Lives of the Sophists (c. 230 - 240 CE)
Diogenes Laertius
Lives and Opinions of Eminent Philosophers (c. 230 - 250 CE)
Porphyry
Isagoge or Introduction to Aristotle's Categories (c. 268 - 270 CE)
Against the Christians (c. 270 CE)
Life of Plotinus (c. 270 - 275 CE)
Life of Pythagoras (c. 270 - 280 CE)
On the Abstinence from Killing Animals (c. 270 - 280 CE)
On the Cave of the Nymphs in the Odyssey (c. 270 - 280 CE)
Tetrabiblos (c. 270 - 280 CE)
Letter to Marcella (c. 303 - 305 CE)
Iamblichus
The Letters (c. 300 CE)
On the Mysteries (c. 300 CE)
Life of Pythagoras (c. 300 CE)
On the Pythagorean Way of Life (c. 300 CE)