Further discussion about Hippolytus and the date of Jesus’s birth can be found in T.C. Schmidt, “Calculating December 25 as the Birth of Jesus in Hippolytus’ Canon and Chronicon,” Vigiliae Christianae 69.5 (2015), pp. 542–563; T.C. Schmidt, trans., Hippolytus of Rome’s Commentary on Daniel (Piscataway, NJ: Gorgias Press, 2022).