Reuben, Reubenites, Reubenite, Reuben's

Facts:

Reuben was the firstborn son of Jacob. His mother was Leah.

When his brothers were planning to kill their younger brother Joseph, Reuben spared Joseph's life by telling them to put him into a pit instead.
Reuben came back later to rescue Joseph, but the other brothers had sold him as a slave to merchants passing by.
Reuben's descendants became one of the twelve tribes of Israel.