A landmark alimony case involving a Quebec billionaire and his ex-girlfriend begins another round on Monday.

The woman, who lost her initial bid for major alimony payments from the man, will launch an appeal at the Montreal courthouse.

The earlier ruling denied the woman $56,000, a share of the family estate and a lump sum of $50 million.

The 35-year-old woman, who had lived with the man for 10 years and is the mother his three children, is currently receiving $36,000 in child support every month.

The woman's legal team argued that people in common-law relationships should receive the same treatment as people in legal marriages, once they split up.

But the court ruled that common-law couples do not have the same rights as married couples under Quebec's civil code.

If the woman in question had been legally married to the billionaire, she would have been entitled to claim much of the money that had accumulated throughout the course of their relationship.