Suetonius has this to tell us in Chapter 9 of his biography of Titus:
When two men of patrician family were found guilty of aspiring to the throne, he satisfied himself with warning them to abandon their attempt, saying that imperial power was the gift of fate, and promising that if there was anything else they desired, he himself would bestow it. [Suetonius lists then at some length some conspicuous marks of favour Titus showed to these men] It is even said that inquiring into the horoscope of each of them, he declared that danger threatened them both, but at some future time and from another, as turned out to be the case.
I wonder - do we know who these men were? Can they be identified with known victims of later emperors?