Keills Chapel was formerly the parish church of Knapdale and probably dates back to the 12th century. It was in regular use until the late 17th century.
For the later associated chapel at Kilmory see here.
The chapel was placed in state guardianship in 1972, and is now maintained by Historic Scotland.
The chapel contains an important collection of gravestones.
One of the most important pieces is the Keills cross (and a replica stands on the hillside above the church) [see Canmore for the record]. It probably dates to the 8th or 9th centuries, suggesting earlier origins of the Christian community at the spot.
Further details of Keills (and with associated walks) can be found in The Footsteps of Kings.