Viscount

A viscount is a member of the British peerage ranking above a baron and below an earl. A viscount is said to hold a "viscounty" or "viscountcy".

The children of a viscount are known as the Honourable [Firstname] [Lastname].

The word derives from the Latin vice comes which was the rank of a deputy to a count.

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The same or a similar rank exists in other monarchies.