LÉ Grainne (CM10) was a in the Irish Naval Service

Irish Naval Service

The Naval Service is the navy of Ireland and is one of the three standing branches of the Irish Defence Forces. Its main base is in Haulbowline, County Cork....

. She was the former . She was named after Gráinne, a legendary princess who was promised to Fionn Mac Cumhail but ran away with his young follower Diarmuid.

Oulston was purchased from the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

in 1971, and commissioned as Grainne. She was stricken in 1987 and sold to Spanish interests for breaking.