Elazar Ben Yair's Ostracon, or potsherd found on Masada
The Sicarii used a lottery to determine who would kill whom. Ten were chosen to kill all the 960, then each other. It is a good guess to assume that Elazar Ben Yair was one of the ten. And probably the last man standing, before he took his own life.
If I had to guess, then the seven survivors, two women and five children, were related to Elazar Ben Yair. And it is that fact that I used to establish the Sicarii dynasty that kept the secret of God's Treasure alive.