Lord John Grey is an English soldier and diplomat. At age sixteen, he meets the infamous Jamie Fraser before the Battle of Prestonpans, and the two do not meet again until he becomes the governor of Ardsmuir, a Scottish prison. They form a tenuous friendship, which soon becomes complicated by the fact that Lord John has fallen in love with Jamie.
Lord John is a main character in the Outlander novels and the protagonist of a subseries of historical mysteries, the Lord John novels and novellas. The Lord John stories take place during the period of time that Jamie is paroled at Helwater.
Secretly homosexual “in a time when that particular predilection could get one hanged,” the character has been called “one of the most complex and interesting” of the hundreds of characters in Gabaldon’s Outlander novels.