The Sadducees were so named because they claimed to be descended from Zadok, the high priest at the time of King David and King Solomon. They consisted of the wealthy aristocratic families who controlled the office of high priest. They rejected belief in angels and the resurrection, but they were not liberal rationalists. Rather, they were staunch conservatives, who observed the Law of the Books of Moses (Pentateuch) and who rejected later interpretations of the law, the 'oral law'. Bible History Online.