Revelation 4:2

Instead of a dative or genitive, "sitting" is used with an accusative giving a slightly different nuance than "sitting on."

Example patterns from Homeric usage:

• καθήμενος ἐπὶ Νέστορα → “sitting toward Nestor” / “seated facing Nestor” (Il. 10.54)

• ἐπὶ Θρῃκῶν καθορώμενος αἶαν → “watching the land of the Thracians” (Il. 13.4) — here ἐπὶ + accusative signals attention / focus on.

(cf. LSJ ἐπί C.3)