More's father, born in Scotland, was a rector at a Huguenot college in the small village of Castres in Languedoc. In 1636 he left to study theology in Geneva, where he became professor in Greek in 1639. By 1648, he was professor of theology, pastor and dean of the Academy in Geneva.
He was working in the Netherlands in the 1650s. In 1654, John Milton launched a vitriolic attack upon him, in his Defensio Secunda, in the mistaken belief that he was the author of an anonymous Royalist work containing a "rabid" attack on Milton, called Regii sanguinis clamor ad coelum (Cry of the King's blood to Heaven). Morus replied with Fides Publica in 1654, published like the Regii sanguinis by Adriaan Vlacq (also attacked by Milton). Milton then launched a second attack after Morus's reply. The true authorship of the Regii sanguinis, written by Pierre Du Moulin, sent to Salmasius and only seen into print by Morus, came out in 1670.
- David Masson, The Life of John Milton, Volume 5 (of 7), 1654-1660
- Alexandri Mori ecclesiastae & sacrarum litterarum professoris fides publica. Contra calumnias Ioannis Miltoni, Hagae-Comitum (S'Gravenhage): Vlacq, 1654.
- A. Bruce (1813), A critical account of the life, character and discourses of Mr. Alexander Morus
- Gloria Rose: A Portrait Called Carissimi. Music & Letters, Vol. 51, No. 4 (Oct., 1970), pp. 400-403
- "More, Alexander". Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900.
- Wiep van Bunge, The Early Enlightenment in the Dutch Republic, 1650-1750, BRILL 2003, ISBN 90-04-13587-1, page, 23-29
- Hubert Cunliffe-Jones, History of Christian Doctrine (2006), p. 427.
- Barbara Kiefer Lewalski, The Life of John Milton: A Critical Biography (2002), p. 321.
- William Riley Parker, Gordon Campbell (editors), Milton (1996), p. 612.
- Concise Dictionary of National Biography, article Alexander More.