Created in 1440, the title Viscount comes from the Latin “vicecomes“, or “vicecount“. The Viscount was a sheriff of a shire (county) and was the Earl‘s deputy. The normal form of address is Lord/Lady.
Viscountcy/Viscounty – This title is mostly confined to the United Kingdom and France, though it appears rarely in Italy and elsewhere. This is the leftover title, what the King bestowed on someone who was not important enough to merit being made a Count. It’s rather late innovation. It originated in France, as the Count‘s deputy, I.e. the “Vice Count“.