Daniel 8:21
And the rough goat is the king of Grecia: and the great horn that is between his eyes is the first king.
Cross-reference
Daniel 8:5–7
Allusion
Daniel 8:5-7 records the goat attacking the ram — the vision that Daniel 8:21 interprets as Greece conquering Medo-Persia.
Daniel 11:3
Parallel
In Daniel 11:3, the same 'mighty king' of Greece appears — Alexander the Great, directly paralleling the goat's large horn.
Daniel 7:6
Parallel
In Daniel 7:6, the leopard beast with four wings and four heads represents Greece — the same kingdom as the goat in chapter 8.
Daniel 10:20
Parallel
Daniel 10:20 mentions the prince of Grecia — the same kingdom as the goat in Daniel 8:21, but in a spiritual warfare context.
Zechariah 9:13
Contrast
In Zechariah 9:13, Greece (Javan) is judged by God — a different role than the conquering goat, but still the same nation.