 Drusilla was most probably born in Caesaria (modern Cherchell, Algeria), the capital of the Roman Client Kingdom of Mauretania.She was named in honor of her father's second maternal cousin Julia Drusilla, one of the sisters of the Roman Emperor Caligula who died around the time of her birth and is also the namesake of her paternal aunt Drusilla.Her father was executed while visiting Rome in 40.