Substitutio Hæredis

Lat In Roman law, it was competent for a testator after instituting a hæres (called the "hæres institutus") to substitute another (called the "hœres substitutus") in his place in a certain event. If the event upon which the substitution was to take effort was the refusal of the instituted heir to accept the inheritance at all, then the substitution was called "vulgaris," (or common;) but if the event was the death of the infant (pupillus) after acceptance, and before attaining his majority, (of fourteen years if a male, and of twelve years if a female,) then the substitution was called "pupillaris," (or for minors.) Brown.