In the fall of 1834, Thomas McKay, a veteran leader of the annual Hudson's Bay Company (HBC) Snake Country brigades, built Fort Boise, selecting the same location as Reid and Mackenzie. Although McKay had retired in 1833, the HBC Chief Factor John McLoughlin sent him to establish Fort Boise in 1834 to challenge the newly built American Fort Hall further east on the Snake River.
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.