In 1641, he responded to a request by the English parliament and joined a commission there charged with the reform of the system of public education. The English Civil War interfered with the latter project. According to Cotton Mather, Comenius was asked by Winthrop to be the President of Harvard University (this being more plausibly John Winthrop the Younger than his father as junior Winthrop was in England) but in 1642, Comenius moved to Sweden instead to work with Queen Christina (reigned 1632–1654) and the chancellor Axel Oxenstierna (in office 1612–1654) on the task of reorganizing the Swedish schools. The same year he moved to Elbląg (Elbing) in Poland and in 1648 went to England with the aid of Samuel Hartlib, who came originally from Elbląg. In 1650 Zsuzsanna Lorántffy, widow of George I Rákóczi prince of Transylvania invited him to Sárospatak. Comenius remained there until 1654 as a professor at the first Hungarian Protestant College; he wrote some of his most important works there.