In the 12th century, the Normans conquered much of County Antrim and County Down and created the core of the Earldom of Ulster.
The Normans conquered much of County Antrim. This was in the 12th century. The Normans conquered much of County Down. This was in the 12th century. The Normans created the core of the Earldom of Ulster. This was in the 12th century.