A number of notable people have considered themselves Unitarians, Universalists, and following the merger of these denominations in the United States and Canada in 1961, Unitarian Universalists.
Additionally, there are persons who, because of their writings or reputation, are considered to have held Unitarian or Universalist beliefs.
The same principle can be applied to those who believed in universal salvation but were not members of Universalist organizations.
But beginning in the nineteenth century the theologies of the two groups started becoming more similar.
However, with only a few exceptions, all belong to the UUA—even those that maintain dual affiliation (e.g., Unitarian and Quaker).