Oh man a good chunk of my novel The Lost Forest will show the life of King Elzra and the creation of the guardians. If done correctly then a good flashback is one of my favorite things about reading.
For example in the manga Berserk the second arc is called the Golden Age Arc where we get to read the past of the main character and what influenced him to become the character that we see in act 1.
Any time we get to see the past of our characters,the history of the world then I am all for it.
