WORLD HISTORY

Detailed explanation-1: -Sir is used to address a man who has the rank of baronet or knight; the higher nobles are referred to as Lord. Lady is used when referring to women who hold certain titles: marchioness, countess, viscountess, or baroness. It can also be used of the wife of a lower-ranking noble, such as a baron, baronet, or knight.

Detailed explanation-2: -peerage, Body of peers or titled nobility in Britain. The five ranks of British nobility, in descending order, are duke, marquess, earl (see count), viscount, and baron. Until 1999, peers were entitled to sit in the House of Lords and exempted from jury duty.

Detailed explanation-3: -lord, in the British Isles, a general title for a prince or sovereign or for a feudal superior (especially a feudal tenant who holds directly from the king, i.e., a baron). In the United Kingdom the title today denotes a peer of the realm, whether or not he sits in Parliament as a member of the House of Lords.