 Nowadays, this authority is not delegated to the current generation's Sages, and thus the Torah can not be commentated on, in matters concerning the Halakha, if it is in contradiction to Chazal's commentary.Earlier on, up until the midst of the Tannaim era, when there was a Sanhedrin (a Jewish law court), Chazal had also the authority to decree predestinations and to enact new religious regulations, in any matter they saw fit, concerning issues that were not included in the written "Torah", or were not handed at Biblical Mount Sinai.Rishonim ("the first ones") were the leading Rabbis and Poskim (Halachic decisors) who lived approximately during the 11th to 15th centuries, in the era before the writing of the Shulkhan Arukh (Code of Jewish Law) and following the Geonim.