Musa al-Kazim (Arabic: الإمام موسى الكاظ (Approximately: October 28, 746 AD - September 1, 799 AD) was the seventh of the Twelver Shia Imams. He was the son of the sixth Shi’ah Imam, Ja'far al-Sadiq, and his mother’s name was Hamida Khatoon. He was born during the power struggles between the Umayyad and the Abbasid. Wikipedia
The definitive Wikipedia entry for Musa Al-Kazim. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Musa_al-Kazim
He is known as al-Abd al-Salah (the pious worshipper of God) and also he is described as al-Kazim (the restrained), peace be on him. al-islam.org/masoom/bios/7thimam.html