After evaluating Deirdre for 3 years, Emer was ordered by the Irish Naval Service in 1975. Commissioned in January 1978, she was named after Emer, the principal wife of Cúchulainn, a legendary Irish folk hero.[2]
She was an improved version of the sole of class Deirdre and similar to LÉAoife(P22) and LÉAisling(P23)[citation needed]. She was commissioned on 16 January 1978 and had 35 years of service with the Irish Naval Service.[2]
Decommissioned on 20 September 2013,[3] in October 2013 Emer was sold at auction for €320,000 to a Nigerian businessman.[4]
In July 2014 Emer was impounded by the Nigerian Navy because the new owner had failed to secure the necessary military approval before bringing the ship into Nigerian waters.[5] On 19 February 2015 Emer was commissioned into the Nigerian Navy as a training ship and renamed NNS Prosperity.[6][7]
