Revelation 17:9-12 Here is the mind which has wisdom [and this is what it knows about the vision]. The seven heads are seven hills on which the woman sits; and they are seven kings: five of whom have fallen, one exists | Amplified Bible (AMP)

Revelation 17:9-12 AMP

Here is the mind which has wisdom [and this is what it knows about the vision]. The seven heads are seven hills on which the woman sits; and they are seven kings: five of whom have fallen, one exists and is reigning; the other [the seventh] has not yet come, and when he does come, he must remain a little while. And the beast that [once] was but is not, is himself also an eighth king and is one of the seven, and he goes to destruction (perdition). The ten horns that you saw are ten kings who have not yet received a kingdom, but [together] they receive authority as kings for a single hour [for a common purpose] along with the beast. [Dan 7:20-24]

Read Revelation 17