viscount

n. nobleman below an earl and above a baron

A viscount (pronounced ) is a member of the European nobility whose comital title ranks usually, as in the British peerage, above a baron, below an earl (in Britain) or a count (his continental equivalent).
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Noun
1. a British peer who ranks below an earl and above a baron
(hypernym) peer

Noun
1. (in various countries) a son or younger brother or a count
(hypernym) Lord, noble, nobleman

(a.)
An officer who formerly supplied the place of the count, or earl; the sheriff of the county.
  

(a.)
A nobleman of the fourth rank, next in order below an earl and next above a baron; also, his degree or title of nobility. See Peer, n., 3.
  

The name given to officers William I chose to replace the English Sheriffs , eventually growing in stature in the peerage to follow counts and earls , superseding the rank of baron .
In the SCA , the title of ‘viscount’ is awarded to princes who have served a single reign as head of principality , carrying the address, ‘Your Excellency ’ and ranking as in history, above baron but below a count or earl .