This question bothers on me on two accounts.
First, it seems to be a pretty easy combination of words. Look up each word in the dictionary and then put the meanings together.
But the main thing is asking for an exlanation of the hierarchy. This is at borderline offtarget because we are supposed to be dealing with questions about English, but on the other hand these "royalty" terms are part of English. Which is why I "suggested" that the OP do their own Internet Search to get an explanation of these terms and their hierarchy. Because to me anything besides a general meaning is offtopic. And certainly an explanation of the whole hiearchical system is beyond the scope of ELL.
But my wider "complaint" is that there have been lots of questions in which an answer could have been gotten by the ELLearner simply doing an internet search for the answer. Is it not possible for such people to perform this function?
These include, obviously, dictionary definitions. But also, I think, first tries at Idiom meanings, because there are plenty of Idiom Dictionaries out there, and/or dictionaries that define many idioms. I think that a poster could just do an internet search for an Idiom rather than ask here first. That is minimal research. (And yes I will go read the related meta question about what to do about idioms,...I am using them only as an example here.)
And that leads into such questions about "explaining the hierarchy of royal titles." or asking other broad questions that are more subject oriented than EL oriented. I guess I am blowing off some steam, because it just seems to me that a lot of folks could easily find an answer on the internet, rather than post a question here.
Then there is the what is the difference between the simple past and the present perfect, or explain how the past perfect works. I mean, are such broad questions on topic here? And again, it seems to me that a ELLearner could just sit down and type those exact words into google or bing or yahoo or whatever and get many site that will do just what the learner is asking.