So how did it all begin? Without going into great detail, we can look at the seventies and the illegal ordinations that happened at that time. The heretic James Pike had previously ordained a woman to the diaconate, but the ball really got rolling in 1974.
…women deputies were not accepted by General Convention until 1967. By this time the controversial liberal bishop James Pike had already ordained a woman as a deacon, an ordained role oriented toward service and without all the sacramental duties of the priesthood. With the encouragement of the women’s movement in the larger society, other breakthroughs followed quickly. The General Convention of 1970 accepted female deacons, and the 1976 Convention admitted women to the priesthood, following the unauthorized 1974 ordinations of eleven women as priests. The first Episcopal woman bishop, Barbara Harris, was consecrated in 1989.
Nevertheless, in the summer of 1974, in Philadelphia’s Church of the Advocate, eleven women deacons were ordained to the priesthood by three Episcopal bishops. Two of the bishops were retired; the third had resigned as bishop of Pennsylvania earlier in the year. Neither the bishops, nor the deacons, nor the parish had authorization for the ordinations. In an emergency session, the House of Bishops declared the ordinations invalid and rebuked the ordainers.” (page 168)