The First 5 Books of the Bible are referred to as:
the Torah, the Pentateuch, or the Law of Moses. 

Books:
1. Genesis
2. Exodus
3. Leviticus
4. Numbers
5. Deuteronomy

Who:
According to tradition, the first five books of the Bible were written by Moses.

When:
These books were written sometime between 1446-1406 BC.