Who were the founders of Anti Trinitarianism?

Anti Trinitarianism has existed since the foundation of the Holy Trinity at the Council of Nicea. Many reformers have presented their ideas in the past. Yet many regard Spainard Michael Servetus  from Villanueva de Sigena as the founder. This can mostly be attributed to his opinions and life during the Protestant Reformation. A famous Anti Trinitarian scholar, Servetus brought the idea to the forefront and took new followers.