The principle that the nationality of children is the same as that of their parents, irrespective of their place of birth. This contrasts with * jus soli

, whereby nationality is dependent on place of birth.

What is the purpose of jus sanguinis?

The exclusive version of the law of the blood (“Jus sanguinis”) promotes the principle that a child acquires the nationality from his parents (—and in some countries only from the father, not the mother), with the place of birth not being a factor. This is commonly the case in Europe, Asia and parts of Africa.

What's the difference between jus soli and jus sanguinis?

…of the time of birth: jus soli, whereby citizenship is acquired by birth within the territory of the state, regardless of parental citizenship; and jus sanguinis, whereby a person, wherever born, is a citizen of the state if, at the time of his or her birth, his or her parent…