Oh yes it did - in 1921 the British cut off 78% of Palestine so as to give the Hashemites a Kingdom. This was to solve a little problem they had with Saudi Arabia (where the oil was/is) as there were 2 claimants to the throne.
They arbitrarily created Trans-Jordan which was considered an illegal act by the League of Nations. But then of course nothing could be done about it because Britain was the superpower of the region.
Any map of the area prior to 1921 will show Trans-Jordan as part of Palestine.