Essentials did not have a PH1, and was not considered a separate edition from 4e, anymore than 3.5 was - probably less, since it was officially, painstakingly, if not exactly honestly, fully compatible with the rest of 4e.
Without double-counting Essentials, the Barbarian, Sorcerer, Warlock and Warlord had existed in only one PH1 prior to 5e. The Assassin and Illusionist (as such, distinct from wizardly school specialization), had existed in only one, and only as sub-classes.
(If you break the Wizard up into specialist and non-specialist, it gets funny, as there essentially is no non-specialist wizard in 5e, though there was in every prior edition.)