Zilpah was the last of Yackov's four wives and the mother of Gad and Asher. She was a half sister of Rachel and Leah from their father Laven though his marriage to a concubine and a younger sister of Bilhah. She is buried in Teveria in the 'Tomb of the Imahos'.
She was given as a maidservant to Leah as wedding gift by her father Lavan. Since she was younger than Bilhah, Lavan purposely gave her to Leah to fool Yackov into thinking she was Rachel, the younger sister since common logic would alot the younger maidservant to the younger daughter.
 Kever Zilpah
Zilpah is buried in Teveria in the 'Tomb of the Imahos'.