Daniel 8:3 describes the ram with two horns that Daniel 8:20 explicitly identifies as the kings of Media and Persia.

Daniel 2:39 describes the silver kingdom of Medo-Persia — the same empire as the ram in Daniel 8:20, within Daniel's prophecies.

Daniel 5:28 declares the kingdom given to Medes and Persians — the exact dual empire the ram represents.

Daniel 11:2 expands on Persian kings after the ram of Daniel 8:20, providing historical detail about the same empire.

Esther 1:3 names 'Persia and Media' together — confirming the dual empire represented by the ram in Daniel 8:20.