Nouns can be specific or nonspecific. To make a noun specific we use specifiers such as determiners (this, that, these, those), possessive determiners (my, your, his, her, our, its, their), articles (the, a), and quantifying determiners (every, each, either, neither, both, all, half). In most cases, you want to use a determiner because otherwise, you aren't talking about anything specific. Without a determiner you are only talking about a category or an abstraction. There are many situations where a specifier is not needed. You can be nonspecific if you choose to, either because you want to be imprecise or because specificity just doesn't matter. Another situation where specifiers are not needed is when the noun is used in the style that English teachers like to call "uncountable". As a first example, consider "He is king of France" in which specificity just doesn't matter. You can add "the" but it adds nothing of importance. "He" belongs to the abstract category of "kings of France". Here's another example. In "King Alexander, hero to his people, reigned over Swan's Paradise for decades." no specifier is needed. Alexander belonged to the abstract category of "heroes". Here's another, "Joy overcame her emotions. She was so happy" in which "joy" works best without any specifier. You could say "a" joy. It would not be wrong. But "joy" is an example of a noun that is normally treated as "uncountable". That means it flows like water or hope. We don't normally count our joys. We don't normally point to them like: "Look at that joy over there!". We don't specify them. Instead, we float in them as if they were a sea.

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Without an example it's a little difficult to give an accurate response, so I'll just share my general thoughts: Sometimes: 1. The focus is more on the title/role as compared to the person. - Where is the King of the North? (Focus is on the person...so we need "the") - He is King of the North. (Focus is on the title/role, so we don't need "the"....you can include "the"...but it isn't necessary). - To be king is an honor (Focus on the title again, so "the" doesn't change the meaning of the sentence...we don't need an article. This applies to other positions/roles like Mayor, President, Chairman... especially when it is known that there can only be ONE person in that position.

If it's referring to becoming the king/serving the role of king, then it may not have an article. 'He is the boy who will become king.' 'Once you are king, you will rule all of the land.' 'When I am king, I won't have to....' For the above examples, you could also use 'the' as it's referring to a specific kingship. There may be other examples, but this is what came to mind. The above examples would work for 'queen,' also.