Short answers, pulled from the story.
Unitarianism holds that God is a single, unified being and rejects the doctrine of the Trinity. Most Unitarian theological interpretations regard Jesus Christ as the Son of God and a spiritual and moral teacher of unparalleled insight, but subordinate to God rather than equal to him.
Unitarianism emerged almost simultaneously in the Polish-Lithuanian Commonwealth and in Transylvania in the mid-16th century. The earliest institutional expression was the Unitarian Church of Transylvania, founded by Ferenc David in 1565 and formally recognized by the Edict of Torda in January 1568.
Ferenc David, who lived from around 1520 to 1579, was a preacher and theologian who founded the Unitarian Church of Transylvania. A former Reformed bishop, he began preaching Unitarian doctrine in 1566 and led the first Unitarian denomination known to have emerged during the Reformation era.
The first avowedly Unitarian congregation in England was founded in 1774 at Essex Street Church in London by Theophilus Lindsey and Joseph Priestley. In the United States, the first official acceptance of Unitarianism by a congregation was at King's Chapel in Boston, where James Freeman began teaching Unitarian doctrine in 1782.
Four presidents of the United States were Unitarians: John Adams, John Quincy Adams, Millard Fillmore, and William Howard Taft. John Adams is widely considered the first Unitarian president.
Eleven Nobel Prizes have been awarded to Unitarians. Recipients include Robert Millikan and John Bardeen in physics, Albert Schweitzer, Emily Green Balch, and Linus Pauling for peace, George Wald and David H. Hubel in medicine, Linus Pauling in chemistry, and Herbert A. Simon in economics.