A more thorough explanation:

ESSENTIALIA FEUDI

Essentialia feudi is a Latin term used in Scots law to refer to the essential terms of a feudal right. It is the basic and necessary elements that make up a feudal right.

Examples of essentialia feudi include:

• The name of the feudal lord
• The name of the vassal
• The description of the property
• The nature and extent of the services to be rendered by the vassal

These examples illustrate the definition of essentialia feudi because they are the fundamental elements that must be present in a feudal right. Without these essential terms, the feudal right would not be valid or enforceable.

ACCIDENTALIA FEUDI - refers to the non-essential terms of a feudal right.