Crikey!
Martial wrote a poetic epigram for Erotion the Slave Girl:
Hic festinata requiescit Erotion umbra,
crimine quam fati sexta peremit hiems.
quisquis eris nostri post me regnator agelli,
manibus exiguis annua iusta dato:
sic lare perpetuo, sic turba sospite solus
flebilis in terra sit lapis iste tua.
Line two says� �She�d have completed her sixth chill winter�
I am probably wrong, but perhaps, �duodecennium hiems� might be something along the line of �twelve years of winter�.