The first of Nisan marks the beginning of G-d's calendar given to the Israelite nation (Exodus 12:2).
Circa 1310 BCE- On this date the second year after the Exodus from Egypt, the tabernacle was first erected at Sinai (Exodus 40:17). Aaron began serving as the high priest after his eight-day consecration (Leviticus 9:1) and two of his sons, Nadav and Avihu, died after entering the Holy of Holies with "strange fire" (Leviticus 10).
c 726 BCE- During Hezekiah's reign as king, the Israelites reconsecrated the Temple of G-d on this date (2 Chronicles 29:17).
c 580 BCE- Ezekiel receives the prophecy that Egypt would be given into the hands of Nebuchadnezzar and the Babylonians empire (Ezekiel 29:17-20).
c 525 BCE- Mordechai uncovers the plot of Bigtan and Teresh to assassinate King Ahasuerus (Esther 2:21-23).
c 517 BCE- Ezra and the leaders of Israel finished investigating all the men who had married foreign wives on the first day of the first month (Ezra 10:17).
1329- Many Jewish communities were destroyed during the Black Death Persecutions. The people: of Muhlhausen, Thuringia, were advised by Count Fredrick to kill all the Jews in the town, as "they had set out to destroy all Christendom." Subsequently, all of the Jews in the town were massacred.
1564- Pope Pius IV authorized the printing of the Talmud on the condition that the text be censored and the word "Talmud" deleted.