 Such orders of succession, derived from rules established by law or tradition, usually specify an order of seniority, which is applied to indicate which relative of the previous monarch, or other person, has the strongest claim to assume the throne when the vacancy occurs.Often, the line of succession is restricted to persons of the blood royal (but see morganatic marriage), that is, to those legally recognized as born into or descended from the reigning dynasty or a previous sovereign.The persons in line to succeed to the throne are called "dynasts".