Killincarrig (Irish: Coillín na Carraige, meaning "Little wood of the rock") is a village between Greystones and Delgany in north County Wicklow. It lies at the crossroads (now a mini-roundabout) of the R762 and the R761 roads. Like neighbouring Delgany it has been steadily built-up over the past 40 years and now forms part of the continuous urban area of Greystones.
Hidden amongst the houses in this small village is a ruin of an old manor house, Killincarrig Castle, which lends it's name to many streets and house names in the village.The ruin is a protected structure. The manor house was built around 1620 and has a rich history. During the Eleven Years War from 1641-1653 the castle was a stronghold for Catholic Confederates.
Later, in 1649, Oliver Cromwell is believed to have a spent a night here whilst searching for his horse which had been stolen by Rebels. In 1798, during the Rebellion it was used as a hiding place by Irish Rebels.
The cache is a small container hidden within view of this old ruin.