The Mausoleum was designed to hold members of this family and those interred within it included Augustus' nephew Marcellus (died 23 BCE), his son-in-law Marcus Agrippa (12 BCE), Drusus the Elder (9 BCE), Augustus' two sons Lucius and Gaius Caesar (2 and 4 CE respectively), and the emperor himself in 14 CE. Then followed a long line of relations and associates including Drusus the Younger,Livia, Tiberius, Agrippina, Nero, Drusus (brother of Caligula), Poppaea, and Nerva.