After the defeat of the Bar-Kochba revolt in 135 AD, the center of Jewish learning in the land of Israel moved to Galilee. With the Arab conquest of the country in the 7th century, Arabic gradually replaced this language.
The most notable extant text in this dialect is Jerusalem Talmud, which is still studied in Jewish religious schools and academically, although not as widely as the Babylonian Talmud.
Many extant manuscripts in JPA have been corrupted over the years of their transmission by Eastern Aramaic-speaking scribes freely correcting "errors" they came across (these "errors" actually being genuine Jewish Palestinian Aramaic features). To date, all formal grammars of the dialect fall victim to these corruptions, and there is still no published syntax.