Nope. There are no such people as Palestinians and there wasn’t any Palestine named area when the Temples were built; nor have there been any “Palestinian” kings, presidents, governments, laws or monetary coinage.
There was coinage during the mandate period, but in English, Hebrew and Arabic. The palestinians were the Jews, Arabs were Arabs. The Jerusalem Post was the Palestine Post. The Israel Electric Corporation was the Palestine Electric. The Palestine national football team which traveled the world was composed mostly of Jews, the Arabs refused to play. And they’ve refused to play ever since. In the 40s many people expected the Jewish State to be named Palestine. You’re right, palestinians as a subset of Arabs have never existed.