According to court statements, in the years after Ghislaine de Vedrines met Tilly in 1999 and introduced him to the rest of the family, he played relatives against each other, creating group paranoia and preying on the family's weaknesses.
"He is a liar, a fantasist," Ghislaine de Vedrines said at the outset of the trial, according to Europe 1. "He kidnapped us, saying anything and everything, and set us against each other."
Tilly was arrested in Switzerland in 2009.
Although Tilly was deemed mentally stable during his trial, French media have reported that he has a history of lies and exaggerations. Tilly claimed before the Bordeaux court that he was a member of the Habsburg dynasty and that he once almost played soccer for Marseille.
Tilly remained defiant Tuesday despite the conviction, saying he is a British citizen and will take his case to the European Court of Justice.
"(The trial) has only just begun," Tilly declared.
His lawyer, meanwhile, said he was not aware that his client was a British citizen.
Picotin said he had hoped Tilly would get a longer sentence. "I'm sure that if he gets out he'll begin again," the lawyer said.
The case raised echoes of another controversial trial involving France's richest woman, 90-year-old L'Oreal heiress Liliane Bettencourt, who was swindled by a French tax lawyer into handing over to him a private Seychelles island.
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