The only man convicted in connection with the Northern Bank robbery is now suing the bank for taking possession of millions of pounds found by gardai at his home.
Retired businessman Ted Cunningham (72) has issued High Court proceedings in Dublin seeking damages for "conversion" of the cash, which he says was seized by gardai under legislation found to have been unconstitutional.
Conversion is the wrongful assertion of control over someone else's goods.
Some £26.5m was stolen in the raid on Northern Bank's headquarters in Belfast in December 2004, which then PSNI Chief Constable Hugh Orde blamed on the Provisional IRA.
Mr Cunningham, of Farran, Co Cork, pleaded guilty to two money laundering offences at a retrial in 2014 and received a five-year suspended sentence.
But in proceedings against Danske Bank, as Northern Bank is now known, he says he pleaded guilty based on his concerns for his health and that he may likely get a non-custodial sentence.
Although his pleas related to sums totalling £275,400, Cork Circuit Criminal Court ordered the confiscation of £2,985,680 and €45,154, which gardai say Mr Cunningham came into possession of after the robbery.
In proceedings initiated in Dublin on Thursday, Mr Cunningham maintains that apart from the substance of the offences for which he was convicted, there was no determination by the circuit court that the monies seized were linked to the Northern Bank robbery.
Mr Cunningham alleges his constitutional property rights were breached by the handing over of the cash to the bank. He claims the seizure and transfer of the monies by An Garda Siochana to Danske Bank was unlawful.
The claims are expected to be contested by the bank.
Mr Cunningham is being represented in the case by Belfast solicitors KRW Law.
The one time financier was arrested at his home in February 2005, two months after the raid, and large sums of cash were seized by gardai.
Mr Cunningham initially went on trial in 2009 on 10 money laundering charges. He was sentenced to 10 years in prison after being found guilty but was released by the Court of Appeal in 2012 and a retrial was ordered.
His release came after the Supreme Court found a section of the Offences Against the State Act 1939, under which the warrant used to search his home was issued, was unconstitutional.
He faced nine charges at his retrial in 2014, but the case ended when he pleaded guilty to two of these.
In 2018 he issued High Court proceedings seeking "a proper accounting" of the money seized at his home. The court refused to grant the reliefs sought.
In his latest action, Mr Cunningham says Cork Circuit Criminal Court ordered the confiscation of sums far in excess of the £275,400 in the charges he was convicted on and that it remains unclear how the court arrived at those figures.
Mr Cunningham also alleges Danske Bank made no application to Cork Circuit Criminal Court for the monies and must have known these were transferred without lawful authority or was reckless in receiving the cash.