Lucius Annaeus Seneca (4 BC-AD 65) is one of the most famous Roman philosophers. Instrumental in guiding the Roman Empire under emperor Nero, Seneca influenced him from a young age with his Stoic principles. Later in life, he wrote Letters from a Stoic, detailing these principles in full.
Seneca's letters read like a diary or a handbook of philosophical meditations. Often beginning with observations on daily life, the letters focus on many traditional themes of Stoic philosophy, such as the contempt of death, the value of friendship, and virtue as the supreme good.