The Jewish high court of justice consisted of 71 men and was led by the high priest. The council could decide almost any fate of its people – except the death penalty, which was decided by the Romans. The court was located within the Chamber of Hewn Stone inside Herod’s Temple.
source:
Hubbard, Shiloh, Elliot Ritzema, Corbin Watkins, and Lazarus Wentz with Logos Bible Software and KarBel Media. Faithlife Study Bible Infographics. Bellingham, WA: Logos Bible Software, 2012.