Stoic philosophy, developed in ancient Greece and Rome by Zeno of Citium, Epictetus, Marcus Aurelius, and Seneca, shares deep structural similarities with mindfulness and Buddhist meditation. Both traditions emphasize the present moment, the impermanence of circumstances, and the primacy of our mental response to events over the events themselves. The Stoic practice of negative visualization (premeditatio malorum — imagining the loss of what you value) and the dichotomy of control (distinguishing what is in our power from what is not) are functionally analogous to mindfulness practices. Ryan Holiday and others have popularized modern Stoicism as a secular alternative to religious meditation.

Reference:

Wikipedia: Stoicism

https://en.wikipedia.org/wiki/Stoicism