From this book, The nationalist crusade in Syria by Elizabeth P. MacCallum. New York : The Foreign Policy Association, 1928, full text here:
The Muslim conquest of Syria and Palestine in the seventh century CE.
And what was the imagined territory if this Syria?
Jerusalem was but a vilayet, a regional administrative unit, not part of a country called Palestine'.
And another source, referring to the year 1937 from this book:-