The army bomb disposal team was called out to Monkstown, Dublin, earlier today after a man carrying out renovation works at a house found a grenade.
The device was identified as a British-made Mills 36 fragmentation hand grenade.
The Mills 36 became the standard grenade used by the British Army early in the 1900s, and saw extensive action during World War I. Outfitted with a four-second fuse, the device was capable of achieving a 100-yds kill zone.
The Mills 36 grenade underwent a series of modifications, and remained in use until the 1970s in the UK, and beyond in some other countries.
The bomb disposal unit retrieved the device and declared the area safe at around 3.30pm.