Domitian
Roman emperor from 81 to 96, who gave his own names to September and October. After his death the names were dropped.
51–96 CE
Where the months got their names
Macrobius, Saturnalia 1.12–14 (early fifth century CE), in the edition of Franz Eyssenhardt (Leipzig, 1893) · early fifth century CE; the dialogue is set in the 380s
12.36
Mensis September principalem sui retinet appellationem: quem Germanici appellatione, Octobrem uero suo nomine Domitianus inuaserat.
September keeps its original name. Domitian had taken it over for his title Germanicus, and October for his own name.