1776: The
1776 Constitution is not
specific on the matter, but as the President and Vice-President
were chosen from among the members of the
Council it appears that
most Presidents chose to leave that office, or were replaced, prior
to the expiration of their term as Counsellor, rather than have an
executive preside over a body of which he was no longer a member. -
Supreme Executive Council of the Commonwealth of Pennsylvania,
Wikipedia.