Oinoloth

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The Oinoloth is the master of Khin-Oin, the Wasting Tower, the second-most potent lord of the Yugoloth race after the General of Gehenna.

Until recently the Oinoloth was Anthraxus, a ultroloth whose head was shaped into that of a diseased ram by a blasphemous pact. The ultroloth Mydianchlarus whispered a secret into his ear so disturbing that it compelled Anthraxus to abandon his throne, allowing Mydianchlarus to take on the role of Oinoloth himself.

Sources: 
Planes of Conflict
Faces of Evil: The Fiends
Dragon Magazine Annual #2
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