Tartaruchus

TARTARUCHUS:  Tartaruchus is a fallen angel who rules hell according to several early Christian texts.  In the APOCALYPSE OF PAUL, an apocrypha dating back to the first days of Christianity, Tartaruchus is named as the DEMON who holds dominion in the underworld until the LAST JUDGMENT, at which time SATAN will return as overlord.  He is spiteful and cruel and takes great enjoyment in tormenting human souls.  Another apocrypha, the APOCALYPSE OF PETER, tells that when the damned beg for leniency, Tartaruchus responds by taunting them that they should have begged for Christ's mercy not his.  The fiend gleefully reminds them that their fate is now sealed, and the days of finding relief are gone forever.  (o)

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Resource List - entry taken verbatim from the original source:

(o) "The Encyclopedia of Hell."  Miriam Van Scott.  St. Martin's Press.  ©1998