sentences:  The grounds include two Spanish chestnuts, said to have been planted by John of Killin in 1556, to mark the confirmation of his acquisition of Castle Leod by Mary Queen of Scots.Castle Leod is widely considered to be the inspiration behind Castle Leoch, the seat and home of the laird of Clan Mackenzie, in Diana Gabaldon's "Outlander" historical fiction series.It was considered as a filming location for the TV series, yet Doune Castle was selected, due to its ease of location.