Who was the 1st king of israelite people?

Answer 1

After the Ten Tribes broke away from Judah, Rehav'am (Rehoboam), son of King Solomon, was Judah's first king. See also:

Rehoboam

More about King Solomon

The reliability of the Hebrew Bible

Answer 2

The Bible's testimony is that David ruled in Judah alone for about seven years, around 1005 BCE, before uniting with Israel. When again the United Monarchy split, Rehoboam was the next king of Judah.

However, while the existence of David is generally accepted, it does remain subject to debate. Furthermore modern scholars say that there never was a United Monarchy and that David would more likely have been just a local chieftain. Some scholars even believe that Judah itself was not united until around 900 BCE. Since the Books of Samuel and Kings were not actually written until some centuries later, the events of the tenth century BCE are clouded in legend. It is somewhat likely that Rehoboam was indeed the first king of a united Judah, but this is far from certain.

Answer 3

Saul was the first king in Israel.