Samuel Prideaux Tregelles (30 January 1813 – 24 April 1875) was an English biblical scholar, lexicographer, Christian Hebraist, textual critic, and theologian.
Tregelles was born at Wodehouse Place, Falmouth, of Quaker parents, but he himself was for many years in communion with the Plymouth Brethren and then later in life became a Presbyterian (or perhaps an Anglican).
His interest in Welsh developed from a desire to spread the Christian gospel and especially to combat the influence of atheism, Roman Catholicism, and Mormonism in Wales.
Tregelles also visited Paris, Hamburg, Berlin (where he met Lachmann), and Leipzig (where he collaborated with Constantin von Tischendorf), Dresden, Wolfenbüttel, and Utrecht.
[8] An acquaintance said of Tregelles that he was "able to shed a light upon any topic that might be introduced", but that to ask him a question was dangerous because "doing so was like reaching to take a book and having the whole shelf-full precipitated upon your head".