According to the Calendar of 354, September 9th is the birthday of the Roman Emperor Aurelian (reigned 270-275), probably in 215. You can see from this image that his date of birth was recorded as V Idu Sep:
According to the Calendar of 354, September 9th is the birthday of the Roman Emperor Aurelian (reigned 270-275), probably in 215. You can see from this image that his date of birth was recorded as V Idu Sep: