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ultimus haeres‘the final inheritor’. In the UK, any property not disposed of by will goes to the Crown.
Collins Dictionary of Law © W.J. Stewart, 2006
ULTIMUS HAERES. The last or remote heir; the lord. So called in contradistinction to the haeredes proximus, (q.v.) and the haeredes remotiores. (q.v.) Dalr Feud. Pr. 110.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.