Which term refers to the law of blood?

The term that refers to the law of blood is "jus sanguinis." This legal principle dictates that a person's nationality or citizenship is not determined by the place of birth, but rather by having one or both parents who are citizens of the state. In essence, it emphasizes the significance of inheritance from one's parents in determining nationality. This contrasts with "jus soli," which grants citizenship based on the state of birth, emphasizing the geographical aspect rather than familial lineage.

Monarchy refers to a form of government led by a king or queen and does not pertain to laws of citizenship. Nobility refers to a social class typically comprising people of high birth or rank, which is unrelated to the legal definitions of citizenship. Understanding the implications of jus sanguinis is essential in discussions of nationality, citizenship laws, and the rights derived from parentage.