A royal forest, occasionally known as a kingswood (Latin: silva regis), is an area of land with different definitions in England, Wales, Scotland and Ireland. The term forest in the ordinary modern understanding refers to an area of wooded land; however, the original medieval sense was closer to the modern idea of a "preserve" – i.e. land legally set aside for specific purposes such as royal hunting – with less emphasis on its composition. There are also differing and contextual interpretations in Continental Europe derived from the Carolingian and Merovingian legal systems.
In Anglo-Saxon England, though the kings were great huntsmen, they never set aside areas declared to be "outside" (Latin foris) the law of the land. Historians find no evidence of the Anglo-Saxon monarchs (c. 500 to 1066) creating forests. However, under the Norman kings (after 1066), by royal prerogative forest law was widely applied. The law was designed to protect the "venison and the vert". In this sense, venison meant "noble" animals of the chase – notably red and fallow deer, the roe deer, and wild boar – and vert meant the greenery that sustained them. Forests were designed as hunting areas reserved for the monarch or (by invitation) the aristocracy. The concept was introduced by the Normans to England in the 11th century, and at the height of this practice in the late 12th and early 13th centuries, fully one-third of the land area of Southern England was designated as royal forest. At one stage in the 12th century, all of Essex was afforested. On accession Henry II declared all of Huntingdonshire to be a royal forest.