who is the eighth king?

This is a brief lexical note. Revelation 17:11 uses the cardinal number ἑπτά, hepta (“seven”) and not the ordinal number ἕβδομος, hebdomos (“seventh”). So the eighth king will come “from (or of) the seven” and not “from the seventh.” καὶ τὸ θηρίον ὃ ἦν καὶ οὐκ ἔστιν καὶ αὐτὸς ὄγδοός ἐστιν καὶ ἐκ τῶν ἑπτά […]