Impressions about National park...
In medieval England, rangers were officials employed to "range" through the countryside providing law and order (often against poaching). Their duties were originally confined to seeing that the Forest Law was enforced in the outlands, or purlieus, of the royal forests. Their duties corresponded in some respects with that of a mounted Forester.
The term ranger seems to correspond to the Medieval Latin word regardatores which appeared in 1217 in the Charter of the Forest. Regardatores was later rendered as rangers in the English translations of the Charter.
However, others translate regardatores as regarders. For example, the fifth clause of the Charter of the Forest is commonly translated thus: "Our regarders shall go through the forests making the regard as it used to be made at the time of the first coronation of the aforesaid King Henry [II] our grandfather, and not otherwise."
A "regard" is considered to be an inspection of the forest.
The earliest letters patent found mentioning the term refer to a commission of a ranger in 1341.
Documents from 1455 state that England had “all manner and singular Offices of Foresters and Rangers of our said Forests”.
One of the first appearances of ranger in literature is in Edmund Spenser's poem The Shepheardes Calendar from 1579: " walk not widely, as they were wont, for fear of rangers and the great hunt."
The office of Ranger of Windsor Great Park appears to have been created in 1601.