Short answers, pulled from the story.
Piotr of Goniądz spoke out against the doctrine of the Trinity on the 22nd of January 1556 during a general synod of the Reformed churches in Secemin. This event sparked a controversy that eventually birthed the Polish Brethren movement.
Prince John II Sigismund Zápolya issued the Edict of Torda in January 1568 to grant official recognition to the Unitarian Church of Transylvania. Ferenc Dávid led this new church after beginning his preaching of the doctrine in 1566.
The term Unitarian first appeared in print as unitaria religio in a document from the Diet of Lécfalva on the 25th of October 1600. It was not widely used until 1638 when the formal recepta Unitaria Religio was published.
King's Chapel in Boston became the first congregation to officially accept Unitarian faith by settling James Freeman in 1782. He revised the Prayer Book into a mild Unitarian liturgy in 1785.
Eleven Nobel Prizes have been awarded to Unitarians across physics, peace, medicine, chemistry, and economics fields. Robert Millikan and John Bardeen won twice for physics while Emily Green Balch, Albert Schweitzer, and Linus Pauling received peace awards.