Ealdorman n. : An alderman.

Example:
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Taxonomy
ealdorman, shires, ealdormen, free encyclopedia, earls, chief magistrate, Anglo-Saxon England, king, Reign, Old English, Anglo-Saxon, early West Saxon, reeve, King Alfred, Latin equivalent, search, elder man, high-ranking.

Defination from the web:
ealdorman was rendered in Latin as dux in early West Saxon charters, and as præfectus (which confusingly, is also the equivalent of ... Towards the end of the tenth century, the term ealdorman gradually disappeared as it gave way to eorl, probably under the influence of the Danish ...