Mihi natalis dies erat

Idibus novembris...

I published this on Facebook last year, but never posted it here. 

It is the date of Augustine's birth. How do we know that his birth occurred on Nov. 13, or rather on the Ides of November? He tells us himself in his preface, addressed to Flavius Manlius Theodorus, of his De Beata Vita, written in 386-87. For Theodorus, you can read Claudian's Panegyricus dictus Theodoro (if you like late antique panegyric). Augustine, within a decade, ended up regretting his admiration of Theodorus (see Conf. vii.9.13). I've introduced this frustulum in English since, like most quotations taken from prefaces addressed to one person, I found it did not stand well on its own. Now that you know the context, it's clearer how he is being a good Ciceronian by establishing the time (natalis dies), the place (balneae), and the participants (Monica mater, Navigius frater, Trygetius et Licentius discipuli, Lastidianus et Rusticus consobrini, Adeodatus filius) of his three-day conversation:

Idibus novembris mihi natalis dies erat: post tam tenue prandium, ut ab eo nihil ingeniorum impediretur, omnes qui simul non modo illo die, sed quotidie convivabamur, in balneas ad consedendum vocavi; nam is tempori aptus locus secretusque occurrerat. Erant autem, non enim vereor eos singulari benignitati tuae notos interim nominibus facere, in primis nostra mater, cuius meriti credo esse omne quod vivo; Navigius frater meus, Trygetius et Licentius, cives et discipuli mei; nec Lastidianum et Rusticum consobrinos meos, quamvis nullum vel grammaticum passi sint, deesse volui, ipsumque eorum sensum communem, ad rem quam moliebar, necessarium putavi. Erat etiam nobiscum aetate minimus omnium, sed cuius ingenium, si amore non fallor, magnum quiddam pollicetur, Adeodatus filius meus. (De Beata Vita 1.6).