The Far Arena

The Far Arena is a novel by Richard Sapir, writing as Richard Ben Sapir. It chronicles the adventures of Eugeni, a Roman gladiator from Domitian's period, who, due to an unlikely series of events, is frozen in ice for 1900 years before being found by the Houghton Oil Company on a prospecting mission in the N. Atlantic.
Lew McCardle is a geologist working for Houghton. While running a test drill, the machine accidentally uncovers a frozen body. Lew is given charge. He immediately calls his friend Semyon Petrovitch, a Soviet scientist. Petrovitch, who specializes in cryonics takes the body to be revived, explaining that it's easier to treat such a case as alive until it's proven life cannot be restored. The blood is pumped from it & various treatments are administered until, amazingly, it comes back to life. It spends the next 15 days in a deep sleep, muttering to itself. The mutterings are recorded, but no-one can figure out the language. Finally, Lew McCardle, who has eight years of Latin, sends for a Catholic nun, who joins him & Petrovitch on their quest to sort out the mysteries of the body.