They once flew around the world on private jets and had their Harrods' shopping delivered to their 100-hectare Oxfordshire estate.
His present for her 40th birthday was a Graff diamond necklace worth £1 million ($1.7 million). She had a Hummer ''just to take my dogs to the vet''.
Now he's an ex-con, she survives on state welfare, and they can't stand the sight of each other.
The long, bitter and astonishingly expensive divorce battle between Michelle and Scot Young has London transfixed. It comes to a head in the Royal Courts of Justice this week.
Scot Young, 51, made a £400 million fortune from property and technology businesses. But he says he has lost it all.
The Independent newspaper reported a sworn affidavit in which he describes a disastrous Russian property deal called Project Moscow. He claims he ended up owing creditors £27 million.
As Ms Young tells it, a lawyer phoned her out of the blue to tell her that her husband had lost all his money, attempted suicide and was seeking help at the Priory clinic, a mental health hospital.
But she claims he squirrelled the cash away in offshore trusts.
Ms Young, a 48-year-old former model, says Mr Young has failed to pay court-ordered maintenance of £27,500 a month, leaving her broke. ''I'm not going to roll over,'' she told the Mail on Sunday. ''I just want the marriage to come to an end and for my daughters and me to be properly looked after.''
She told the Mail her suspicions were aroused by phone calls in which Mr Young told his daughter he would buy her a Rolls-Royce Phantom for her 17th birthday.
But Mr Young says a series of businessmen - his friends - made secret payments of hundreds of thousands of pounds to provide for his wife and their two daughters.
For example, The Independent reported, Topshop tycoon Sir Philip Green said he paid £80,000 to an estate agent in 2008 to help Ms Young pay the rent on a house near Regent's Park in London.
A High Court judge has summoned the businessmen to court: Mr Green, fashion billionaire Richard Caring, Scotland's first billionaire, Sir Tom Hunter, and retail king Harold Tillman.
Lawyers for Mr Young tried to argue that sworn statements from the men would be enough, but the judge said it would be ''ridiculous'' not to cross-examine them.
Earlier this year, Mr Justice Moor jailed Mr Young for contempt of court, after he repeatedly failed to provide documents showing where all his former riches went.
The Financial Times has described the case as the ''last gladiatorial battle of the titans'', in a field where fewer wealthy divorcing couples choose to head to the courts, instead sorting out their differences in arbitration.