A group of religious sisters in Maryland is believed to be the first U.S. Episcopal order to become a Catholic religious community.
On Nov. 1, the All Saints Sisters of the Poor professed their perpetual vows at the Basilica of the Assumption of the Blessed Virgin Mary in Baltimore.
Archbishop Edwin O’Brien, apostolic administrator of the Archdiocese of Baltimore, received the sisters into a newly erected diocesan priory at a special Mass on the feast of All Saints.
I can think of one (two if you see the nuns and monks as separate entities) that Poped ….. I strongly suspect there are more!
http://en.wikipedia.org/wiki/Society_of_the_Atonement
In the early 1970’s they had a wonderfully hospitable house in New York and of course the equally welcoming library in London……. happy days!
Some may find this account of the Episcopal Franciscans interesting in the light of recent developments:
“By 1907, the Wattson-White experiment with tradition was moving toward a crisis. In that year, the General Convention of the Episcopal Church approved a resolution that allowed ministers of other Christian churches to preach from Episcopal pulpits if the local bishop approved. Father Paul and Sister Lurana could not accept that decision. For years they had been appealing for Anglican reunion with Rome, provided the distinctive character of Anglicanism in liturgy, law, and lifestyle could be maintained after unity had been achieved. Now, it seemed to them that the distinctiveness of Anglicanism was being threatened by the General Convention’s decision to allow ministers belonging to other churches to preach from the pulpits of the Episcopal Church. The experiment had indeed reached a boiling-point.”
Not sure how the “distinctiveness of Anglicanism” was preserved by their becoming RC’s but there you are ……
http://www.graymoor.org/sisters/history.html