Herewith, a list of titles commonly in use in Amber, by order of precedence.

King The reigning monarch. In common use in Amber and Rebma. In Tir-na Nóg’th, the term is Ardrí.
Prince A child of a monarch, born in wedlock. In the case of the Amber’s princes, this term is also applied to bastards, out of courtesy. It is also applied to children of the Princes of Amber, albeit in lower-case form.
Duke The highest grade of nobility. In Amber they are the heads of the five noble houses.
Margrave Originally this term refered to counts who held frontier districts. Since such regions tended to be larger than average, and heavily militarised, ‘March lords’ slowly accumulated greater status than others, and now are the second grade of nobility, ranking below Dukes but above Counts. In Garnath the term is Marcas.
Count Also sometimes called an Earl. The term translates as ‘elder’ or senior’, and refers to a chief counselor of the realm. The term came to be used to refer to close friends and companions of royalty. In Garnath the term is Iarla.
Viscount A title meaning ‘vice-Count’, an assistant or deputy Count. It is now the fourth grade of nobility, situated between Counts/Earls on the one hand, and Barons on the other.
Baron The lowest grade of nobility. The word derives from a term meaning ‘man’ in the sense of ‘my man in London’, ie. my representative, my servant, one who exerts himself on my behalf.
Baronet A hereditary title not considered to be nobility, but simply members of the gentry. A baronet is styled ‘Sir’ like a knight. House Chantris use the term Ridder, referring to hereditary knighthoods granted by the Duke.
Knight Any member of the numerous knightly orders maintained by the King and the Dukes. They are often raised from the commons, but such a title can also be bestowed on a member of the nobility. In Garnath the term is Curadh.