legendarium

noun2

1. •
   A literary collection of legends, particularly those detailing the life of a saint.

   • The same society [the Swedish Old-text Society] has begun a continuation of the Old-Swedish Legendarium (in 2 volumes), edited for the society by Professor Stephens. — 1866
2. •
   The collected high fantasy writings of J. R. R. Tolkien relating to the fictional realm of Middle-earth and the universe in which it is set.