Question: I have been scouring the internet for a few days and have not been able to find what I am looking for, so I decided to come here and ask you fine people if you have an answer to my line of inquiry. 

I have been looking for what a group of books is called and why it is named so, id est, the type of series that it is and why it is called that. 

For example, chronicles are multiple pieces of literature that take place in the same place or involve the same character(s). Words like chronicle and saga are examples of what I am looking for.

Answer: 
I -- and maybe others here -- am still not clear on the sense in which you mean "a group" of books.

If you mean a group of books that follow on each other, either telling one long story that was just too big for a single book, or at least related stories centering on the same characters or otherwise related, that's called a "series". Like, "the Harry Potter series". I've always found it curious that if there are exactly three books in such a series, it is called a "trilogy", but there is no commonly used word for a series of two books or four or any other number. (Nobody says "bilogy" or "quadrilogy".)

If you mean a group of books in the same general category of fictional writing, like mysteries versus romances versus science fiction, etc, those are called "genres".

If you mean a group of books that are physically collected in one place, like all the books that I own and that I keep in one room in my house, this is called a "library".

"Chronicles" and "saga" don't mean a group of books. The American Heritage Dictionary, for example, defines "chronicle" as "1. An extended account in prose or verse of historical events, sometimes including legendary material, presented in chronological order and without authorial interpretation or comment. 2. A detailed narrative record or report." I've never seen a definition that implies it must be in multiple volumes. It's true that many fantasy series these days call the series as a whole "The Chronicles of Irving Milqbiscuit the Barbarian" or whatever, so maybe the word "chronicles" is coming to mean a series of fantasy novels, but I don't think it's a recognized meaning now. I don't think I've seen that usage outside of the rather narrow field of fantasy novels. I've never heard anyone refer to "The Chronicles of Perry Mason" or "The Chronicles of Diesel engine repair manuals".
**Antilegomena**: 

> 
> Antilegomena An`ti\*le\*gom"e\*na, n. pl. [NL., fr. Gr. ? against + ? to
>  speak; part. pass. ?] (Eccl.) Certain books of the New Testament
>  which were for a time not universally received, but which are now
>  considered canonical. These are the Epistle to the Hebrews, the
>  Epistles of James and Jude, the second Epistle of Peter, the second
>  and third Epistles of John, and the Revelation. The undisputed books
>  are called the **Homologoumena**. [1913 Webster]][1](http://en.academic.ru/dic.nsf/cide/8108/Antilegomena)
> 
> 
> 

**chronicle and saga**:

roman-fleuve is an example of a chronicle: 

> 
> A novel sequence is a set or series of novels which share common
>  themes, characters, or settings, but where each novel has its own
>  title and free-standing storyline, and can thus be read independently
>  or out of sequence -Wikipedia
> 
> 
> 

[https://en.wikipedia.org/wiki/Category:Novel\_series](https://en.wikipedia.org/wiki/Category%3aNovel_series)