Historia Augusta, Septimius Seuerus 21.1-2
As for Romulus, to begin with him, he left no children who could have been of use to the state, and neither did Numa Pompilius. What about Camillus? Did he have children like himself? What about Scipio? What about the Catos who were so great?  Indeed, for that matter, what should I say about Homer, Demosthenes, Vergil, Crispus, Terence, Plautus, and all the others?