[2] John Trevanion inherited the estate in 1703 after which he improved the manor house existing on the site and developed gardens.

[5] The castle was built close to the site of the original ancient home that had itself undergone expansion during the reign of King Henry VIII.

[6] After Bettesworth-Trevanion left for Paris, unable to pay his bills, Michael Williams II purchased Caerhays from his creditors in 1854.

Seeds brought back from China by Ernest Henry Wilson in 1903 were donated to J.C. Williams by Harry Veitch.

[6] Parts of the original manor remain, including the ancient chapel as well as an old walkway to the sea which retains the name of the Watchhouse Walk.

[14] The castle's garden covers almost 120 acres (0.49 km2), traversed by four named routes,[15] and navigated by trails, grassy paths, and steps.

[19] Filming for Miss Peregrine's Home for Peculiar Children took place over three months on the estate and at Porthluney Cove in 2015.