In English customs, the Caput baroniae (Latin, "head of the barony") was the ancient, or chief seat or castle of a nobleman, which was not to be divided among the daughters, in case there be no son to inherit. Instead, it was to descend entirely to the eldest daughter, caeteris filiabus aliunde satisfactis (other daughters satisfied elsewhere).
This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "article name needed". Cyclopædia, or an Universal Dictionary of Arts and Sciences (first ed.). James and John Knapton, et al.