Former Quebec lieutenant-governor Lise Thibault arrived at a detention centre this morning to begin serving her 18-month prison term for fraud and breach of trust.

Thibault will be detained at a Quebec City facility.

The province's top court rejected her appeal Wednesday that would have seen her serve the sentence in the community.

Thibault, 76, was sentenced last fall to 18 months in jail for the fraud and breach of trust.

She pleaded guilty in December 2014 after a 2007 report by the federal and provincial auditors general revealed she claimed more than $700,000 in improper expenses when she held the vice-regal post between 1997 and 2007.

Her lawyer, Marc Labelle, has not yet said whether he will take the case to the Supreme Court of Canada.