Mr De Rothschild-Hatton claimed to be an Oxford-educated international financier, and the son of his namesake, in order to persuade divorcee Christine Handy to part with more than £300,000.
The 49-year-old, of Bowling Green Road, Cirencester, was found guilty yesterday at Bristol Crown Court of seven counts of obtaining money transfers by deception.
He was also convicted last May of four counts of rape and three counts of sexual assault.
Judge Julian Lambert sentenced De Rothschild-Hatton at Bristol Crown Court to 15 years for the sexual offences and three years for the fraud offences. Both terms will be served consecutively.
Judge Lambert told the court De Rothschild-Hatton had refused to attend his sentencing and added it was "not worth the petrol in the van" to force him.
Passing sentence, the judge said De Rothschild-Hatton "systematically corrupted" his teenage rape victim, getting her pregnant on one occasion.
"From the age of 13 to 17 she was utterly oppressed and he made her miserable. He has despoiled her formative years, which should have been filled with happiness."
Judge Lambert went on: "As well as raping a young girl, he took to preying on an emotionally vulnerable woman. By telling lies disguised by a thin veneer of respectability and education he extracted towards £300,000 from her."
Judge Lambert said De Rothschild-Hatton wasted the money on "high living" to fuel his fantasy of a "jet set lifestyle".

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