In its simplest terms, the definition of a castle accepted amongst academics is "a private fortified residence".

A simple fortified residence was added during the 14th century, expanded and supplemented by a wall and a round tower in the west.

A castle is seen by most to be "a private fortified residence" (place to stay).

The original palace was built in the mid-16th century as a fortified residence.

Cusop Castle is 200 yards from the church, formerly a fortified residence.

The Mamo family built the tower in 1657, as a fortified residence.

It is known from 1091, initially as a fortified noble residence.

The grounds still contain a fortified residence and a small church.

The Ducal Palace, a fortified residence renovated in the 16th century.

The 18th century was a period of great development in European royal architecture, as the need for a fortified residence gradually lessened.