Knock Castle is a private residence on the outskirts of Largs, on the west coast of Scotland.
Around 1870 it was sold to George Elder FRSE (1816-1897), a Scottish businessman with strong links to Adelaide in Australia, who certainly owned the castle in the later 19th century, and died here in 1897.
[4] The remains of this small mansion or castle stand on the edge of a stream with an extensive view to the west over Arran and Bute.
[5] A modern parapet with angle turret surmounts this wall, which bears a stone inscribed "Repaired in 1853."
[5] Nigel Tranter gives a similar description in his The Fortified House in Scotland, and adds that Knock Castle was probably built in the late 16th or early 17th century.