Property developer Sean Dunne is trying to set aside an Irish court order declaring him bankrupt.
The US-based businessman was adjudicated a bankrupt last July over a €161 million debt to Ulster Bank, which arose from property loans.
The High Court's heard he hasn’t been domiciled in Ireland since 2007.
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Mr Dunne, who claims to have debts of $1 billion and assets of $55 million, had filed for bankruptcy in the US.