Leah was the eldest daugher of Rebekah's brother, Laban. She became Jacob's wife as a result of a deceitful trick her father played on him. Jacob was in love with Leah's younger sister Rachel, and he made a deal with Laban that he would work for him for seven years in return for Rachel's hand in marriage. Jacob dutifully served Laban for seven years.
Then Jacob said to Laban, "Give me my wife. My time is completed, and I want to lie with her."
So Laban brought together all the people of the place and gave a feast. But when evening came, he took his daughter Leah and gave her to Jacob, and Jacob lay with her. (Genesis 29:21-23)
When morning came, there was Leah! So Jacob said to Laban, "What is this you have done to me? I served you for Rachel, didn't I? Why have you deceived me?"
Laban replied, "It is not our custom here to give the younger daughter in marriage before the older one. Finish this daughter's bridal week; then we will give you the younger one also, in return for another seven years of work." (Genesis 29:25-27)
Jacob had no choice but to work for another seven years after which he got married to Rachel. Though he loved Rachel more than her elder sister, Leah still managed to bear him six sons [see The Twelve sons of Jacob] and one daughter, Dinah. She later accompanied Jacob into Canaan, where she died.
Leah was buried in the Cave of Machpelah in Hebron alongside her husband and his ancestors. Her sister, on the other hand, was buried on the way to Ephrath, which is Bethlehem. Though not explicitly stated in the Bible, this is perhaps suggestive of the fact that Jacob had eventually grown to love this woman - described as "tender-eyed" - as much as, if not more than, the petulant girl he had fallen in love with.