Those of us who were brought up in the 60's & 70's will remember the humour of Monty Pythons Flying Circus and the strange antic of now well know celebrities such as John Cleese, Michael Palin, Eric Idle, Terry Jones, Terry Gilliam and Graham Chapman, they opened the way for other TV heroes such as Spike Milligan and The Goodies.
From the success of the TV series came the films and the Arthurian Legend was rewritten with a mix of the hunt for the Holy Grail, the goblet that Christ was said to have drunk out of and share with the disciples at the last supper before the crucifixion. So the start of the film. If you have not seen the film, I suggest if you have two hours to waste and you in the mood for giggle then check it out.
The film takes you between the English castle, to the French castle but like all movie magic it is film 90% in Scotland and the castle is Doune Castle in Perthshire, particularly around Doune Castle, Glen Coe, and the privately owned Castle Stalker which has public access during the summer months. The many castles seen throughout the film were mainly either Doune Castle shot from different angles or hanging miniatures. There are several exceptions to this: the very first exterior shot of a castle at the beginning of the film is Kidwelly Castle in South Wales, and the single exterior shot of the Swamp Castle during "Tale of Sir Lancelot" is Bodiam Castle in East Sussex; all subsequent shots of the exterior and interior of those scenes were filmed at Doune Castle.
Doune Castle is a medieval stronghold near the village of Doune, in the Stirling district of central Scotland. The castle is sited on a wooded bend where the Ardoch Burn flows into the River Teith. It lies 8 miles (13 km) north-west of Stirling, where the Teith flows into the River Forth. Upstream, 8 miles (13 km) further north-west, the town of Callander lies at the edge of the Trossachs, on the fringe of the Scottish Highlands. Recent research has shown that Doune Castle was originally built in the thirteenth century, then probably damaged in the Scottish Wars of Independence, before being rebuilt in its present form in the late 14th century by Robert Stewart, Duke of Albany (c.1340–1420), the son of King Robert II of Scots, and Regent of Scotland from 1388 until his death. Duke Robert's stronghold has survived relatively unchanged and complete, and the whole castle was traditionally thought of as the result of a single period of construction at this time. The castle passed to the crown in 1425, when Albany's son was executed, and was used as a royal hunting lodge and dower house. In the later 16th century, Doune became the property of the Earls of Moray. The castle saw military action during the Wars of the Three Kingdoms and Glencairn's rising in the mid-17th century, and during the Jacobite risings of the late 17th century and 18th century. By 1800 the castle was ruined, but restoration works were carried out in the 1880s, prior to its passing into state care in the 20th century. It is now maintained by Historic Environment Scotland.
The original castle was a small fort, built around 1320 by Clan MacDougall who were then Lords of Lorn. Around 1388 the Stewarts took over the Lordship of Lorn, and it is believed that they built the castle in its present form around the 1440s. The Stewart's relative King James IV of Scotland visited the castle, and a drunken bet around 1620 resulted in the castle passing to Clan Campbell. After changing hands between these clans a couple of times, the Campbells finally abandoned the castle in about 1840, when it lost its roof. In 1908 the castle was bought by Charles Stewart of Achara, who carried out basic conservation work. In 1965 Lt. Col. D. R. Stewart Allward acquired the castle and over about ten years fully restored it. Castle Stalker remains in private ownership and is open to the public at selected times during the summer.
A Footnote - In the Python film - Meaning of Life -The countryside near Strathblane was used for the Zulu War.
Thanks to https://en.wikipedia.org for some information.