Dean Castle is a 14th century castle located in Kilmarnock, East Ayrshire, Scotland. It was the stronghold for the Boyd Family, who were lords of Kilmarnock for over 400 years, and is situated in a 200-acre site situated within the Dean Castle Country Park. The castle contains a museum collection of European arms and armour, and features an extensive c…Dean Castle is a 14th century castle located in Kilmarnock, East Ayrshire, Scotland. It was the stronghold for the Boyd Family, who were lords of Kilmarnock for over 400 years, and is situated in a 200-acre site situated within the Dean Castle Country Park. The castle contains a museum collection of European arms and armour, and features an extensive collection of early musical instruments.