A more thorough explanation:

Definition: East Greenwich is the name of a royal manor located in the county of Kent, England. It was historically mentioned in royal grants or patents as descriptive of the tenure of free socage.

Example: In the 12th century, King Henry II granted the manor of East Greenwich to his wife, Queen Eleanor of Aquitaine, as part of her dowry.

Explanation: This example illustrates how East Greenwich was a valuable piece of property that was given as a gift to royalty. The mention of "free socage" in the definition refers to a type of feudal land tenure where the tenant held the land in exchange for certain services or payments, but was not bound to perform any military duties.