Lord

The title lord or lady was a term typically used to address individuals holding certain positions, such as noblemen. The term was also used as an alternate term for the Christian "God", and as a general honorific used by the Androids of Mudd for those they serve. 

The title was historically used on Earth for noblemen in some Nation states. Some figures holding the title of lord on Earth were Lord Byron, Lord Halifax, and Lord Nelson. Additionally, a fictional 19th century Lord Burleigh appeared in Kathryn Janeway's holonovel Janeway Lambda one.

Troyian ambassador Petri was referred to as lord. 

An insane Garth of Izar insisted on being called "Lord Garth" while he temporarily took control of the Asylum on Elba II. 

Klingon commander Kruge was also referred to by Valkris and his crew as "my lord".