The Talmud (Rosh Hashanah 10b-11a) cites two opinions as to the date of G-d's creation of the universe: according to Rabbi Eliezer: "The world was created in Tishrei" (i.e., the sixth day of creation--the day on which Adam and Eve were created--was the 1st of Tishrei, celebrated each year as Rosh Hashanah); according to Rabbi Joshua, "The world was created in Nissan." As interpreted by the Kabbalists and the Chassidic masters, the deeper meaning of these two views is that the physical world was created in Tishrei, while the "thought" or idea of creation was created in the month of Nissan. (see "Links" below)

Link: Our Other Head

According to the Talmud, the three Patriarchs of the Jewish people-- Abraham (1813-1638 BCE), Isaac (1713-1533 BCE) and Jacob (1653-1506 BCE)--all were born and passed away in the month of Nissan.

On the first of Nissan of the year 2448 from creation (1313 BCE--two weeks before the Exodus), "G-d spoke to Moses and to Aaron in the land of Egypt" instructing them regarding the setting of the Jewish calendar and that "this month shall be for you the head of months, the first of the months of the year" (Exodus 12:1-2); this was the first mitzvah (divine commandment) given to the people of Israel. On that occasion G-d also commanded them regarding the Passover offering and the various observances of the festival of Passover.

Link: The First Creation

On the day the Mishkan was inaugurated (see above), "Nadav and Avihu, the sons of Aaron, took each of them his censer, and put fire in it, and put incense on it, and offered strange fire before G-d, which He commanded them not. A fire went out from G-d, and consumed them, and they died before G-d" (Leviticus 10:1-2).

Link: The death of Nadav and Avihu: The biblical account, with commentary; the mystical insights

On the eighth day following a 7-day training and initiation period, the portable Mishkan ("Tabernacle" or "Sanctuary") built by the Children of Israel in the Sinai desert was erected, Aaron and his sons began serving as priests, and the Divine Presence came to dwell in the Mishkan; special offerings were brought, including a series of gifts by Nachshon ben Aminadav, the Prince of the Tribe of Judah (similar offerings were brought over the next 12 days by the other tribes of Israel).

Link: The Mishkan

King Hezekiah commenced the reconsecration of the Temple.

Cyrus was crowned "King of Babylonia and King of all lands, "538 B.C.E. The crowning of King Cyrus made possible the restoration of an autonomous Jewish community in Eretz Yisrael and the rebuilding of the Beit HaMikdash. Ezra, who was to restore the primacy of religion in the life of the Jewish community, left Babylonia on the anniversary of Cryus' coronation.

The plot of Bigtan and Teresh to assassinate Achashveirosh was discovered by Mordechai.

Ezra and his followers left Bavel for Jerusalem, 457 B.C.E.