My classics professor was an old boy who gleefully bought Dio and Seutonius' views of Julia and Agrippina (elder and younger). Years of reading and triangulating gave me a more realistic view, but it is only in the last generation of scholarship that a full range of sources (texts, coins, inscriptions, dedications of temples and statues, etc.) have really been reassessed for an analysis of the Julio-Claudian and Severan women, whose physical bodies linked their dynasty to power and whose wits held it together. Although this is a popular piece of scholarship, it is well-calibrated (especially in explaining the tangled family tree just often enough for an interested reader to keep track), and sourced with more academic studies.