[1] Cromarty, then known as Crumbathyn, was created a royal burgh in the reign of King Alexander I of Scotland.
A motte-and-bailey castle was built in the 12th–13th century.
The castle was held by Sir William de Monte Alto during the Scottish wars of independence for both the English and the Scottish.
[2] Sir William's son Thomas built an L-plan tower house.
The castle was demolished in 1772, and the stone and timbers used in the construction of Cromarty House.