In 135, after the Bar Kokhba revolt, many Jewish leaders, expelled from Jerusalem, moved to Galilee. The Galilean dialect thus rose from obscurity to become the standard among Jews in the west. This dialect was spoken not only in Galilee, but also in the surrounding parts. It is the linguistic setting for the Jerusalem Talmud (completed in the 5th century), Palestinian targumim (Jewish Aramaic versions of scripture), and midrashim (biblical commentaries and teaching). The standard vowel pointing for the Hebrew Bible, the Tiberian system (7th century), was developed by speakers of the Galilean dialect of Jewish Middle Palestinian. Classical Hebrew vocalisation, therefore, in representing the Hebrew of this period, probably reflects the contemporary pronunciation of this Aramaic dialect.