Abdul-Salam Mansour Al-Jehani, who was arrested on 15 March in Waterford, pleaded guilty this morning.
Detective Sergeant Donal Donohue told the court he had arrested Al-Jehani, who is originally from Libya, for not having proper identity documents and charged him under the 2004 Immigration Act.
The court heard he previously applied for asylum in the Netherlands under his real name but had been refused and when he came to Ireland in 2001, he applied for asylum under a false name.
In October 2008, he was granted leave to remain in Ireland until July 2011.
Al-Jehani had been remanded in custody last week.
His solicitor told the court he had no previous convictions and that he got married in Ireland four years ago under Islamic contract.
Waterford District Court was told the maximum penalty for the offence is 12 months in prison and/or €3,000 fine.
Judge David Kennedy sentenced Al-Jehani to three months in prison and fined him €1,500.
Another man before the court today, Ali Charaf Damache, originally from Algeria, was remanded in custody to next Thursday.
He is charged with making a menacing phone call to another Muslim man in the US.
His solicitor, Brian Chesser, told the court Mr Damache is an Irish citizen as he holds an Irish passport, adding that a bail application will be before the High Court next Tuesday.
