Question: Who is the paternal grandfather of Julia Drusilla (Daughter Of Caligula)?
Sentence (from "Julia Drusilla (daughter of Caligula)"): Julia Drusilla (Classical Latin: ; middle of AD 39 – 24 January 41), known as Drusilla the Younger (Classical Latin: ; transcribed as "Drusilla Minor") during her lifetime, was the only child and daughter of Roman Emperor Gaius (Caligula) and his fourth and last wife Milonia Caesonia.
Relevant evidence: Yes