1) Mythological Greek character 2) Offspring of Zeus 
• (n.) One of the three judges of the infernal regions; figuratively, a strictly just judge.
a son of Zeus and Europa and a judge of the dead. Legendary for his integrity and for the code of laws he gave Crete.
Rhad`a·man'thus noun [ Latin , from Greek ..........] (Greek Mythol.) One of the three judges of the infernal regions; figuratively, a strictly just judge. 
noun (Greek mythology) a judge of the dead in the underworld
One of three judges of dead in Hades; son of Zeus and Europa.