What are the three major mythological systems in the West?

Greek mythology, Celtic mythology, Norse mythology.

Mythological narrative plays an important role in almost every piece of Greek literature. Nonetheless, Pseudo-Apollodorus's Bibliotheca is the only collection of Greek mythology preserved from the ancient Greek period. This work contains a large amount of original information about Greek mythology (such as the genealogy of the gods), mainly heroic myths, and is an important document for modern scholars to study ancient Greek mythology.

In ancient times, this work was believed to be the work of Apollodorus of Athens who lived from 180 to 120 BC, but it has now been proven that this is a pseudonymous work or a character of the same name, and it was actually written as a book In the 2nd century AD, it is customary today to refer to the author of the book as "Pseudo-Apolodorus".

The earliest references are Homer's two epic poems: "The Iliad" and "The Odyssey". Other epics in this area have been attributed to the "Epic Collection"/"Epic Cycle", but these works have been lost, and only scattered fragments and retellings remain today. There is a group of epic poems that praise the gods or sing about the deeds of the gods called "Homeric Hymns", but they actually have nothing to do with Homer. They are actually derived from It is called a hymn handed down from the early Lyric Period.