This treatise forms part of Seneca’s Dialogi, a corpus of ten treatises which are preserved in Codex Ambrosianus C 90 inf. (= A), an eleventh century manuscript which was copied at the abbey of Monte Casino. Along with this main source, there is also a considerable number of later manuscripts, from the fourteenth century on, which are of lesser and debatable value (Reynolds 1968). The addressee of this treatise is Annaeus Serenus, who held the office of praefectus vigilum under Nero (Pliny NH 22.96) and by the time the treatise was written was a fully-fledged Stoic. That is why this treatise is believed to have been written after Constantia Sapientis – in which Serenus is still an adherent t…

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Garani, Myrto. "De tranquillitate animi". The Literary Encyclopedia. First published 28 August 2013; last revised .
[, accessed 30 May 2015.]