When the Babylonians breached the walls of Jerusalem on the 9th of Tammuz, King Zedekiah fled the city. He was captured by Babylonian troops in the plains of Jericho on the 10th of Tammuz and was taken to King Nebuchadnezzar, who forced him to witness the slaughter of his sons, and then ordered his eyes gouged out.

Links:

Zedekiah - The Last King of Israel
The Destruction of the First Holy Temple

During the summer months, from the Shabbat after Passover until the Shabbat before Rosh Hashahah, we study a weekly chapter of the Talmud's Ethics of the Fathers ("Avot") each Shabbat afternoon; this week we study Chapter Five.

Link: Ethics of the Fathers, Chapter 5