Answer:
King Minos is Cruel is a fact and for the evidence is that he killed his nephew, punished Daedalus as he was merciless and vengeful. He holds grudges against people against him.
He was really cruel, he not just punished Daedalus but also punished his innocent son Icarus and causes his son’s death. Unforgivable, harsh, greedy and Enraged was his cruelty's proof.
Thus, King Minos was cruel.