Forty years.
He ruled in Israel as the first King anointed by Samuel.
King Saul. See: Jewish history timeline
After God chose Saul as the first king of Israel, his personality changed. Power corrupted him, changing him from a humble man to one who was full of pride and self-will. Saul continued to defy God's rule until a new king, David, was chosen to rule. Saul died when he fell upon his sword on the battlefield.
As king, he had none. Saul was the first Hebrew king.
No king Saul and king Solomon are not related.
David was Saul's immediate successor.
Yes, King Saul came from the Jewish tribe of Benjamin.
Saul, the first Israelite king, was followed by King David. See also:Choosing the first kingMore about King SaulThe transition of the throne from Saul to David
Because Saul was not completely obedient to God. In the battle against Amalek, which God had commanded explicitly, Saul didn't finish the job (1 Samuel ch.15; and see also Exodus ch.17 and Deuteronomy 25:17-19).
Saul (שאול)
It was the sword and the crown of King Saul that Amalekite took to David after King Saul's death.