Former Anglo Irish Bank chairman Seán FitzPatrick has begun a legal challenge to a court ruling that he must pay his legal costs following his acquittal earlier this year on charges of giving illegal loans to 16 people.

Judge Martin Nolan found there was no fault in how the State conducted the case and Mr FitzPatrick was not entitled to be awarded costs.

However, lawyers for Mr FitzPatrick told the High Court that Judge Nolan's decision was irrational, unreasonable and amounted to an error of law.

The case will be back before the court in November.