A Viscount is the fourth highest rank of the peerage below Dukes, Marquesses and Earls. A Viscount was traditionally the deputy or lieutenant of a Count or a sheriff. The name Viscount comes from Vice-comes which is the name for the deputy or lieutenant of a count.
A Viscountís wife is a Lady and all his children are The Honourable.
A Viscount is styled Right Honourable and is addressed as Well Beloved Cousin by the King or Queen.