John was the son and heir of Sir John de Grey, 1st Baron Grey de Rotherfield, by Margaret who was daughter William de Odingsells and the granddaughter of Ida II Longespee. John de Grey of Rotherfield was a founding member of the Most Noble Order of the Garter. He is often confused with John Grey of Codnor, who bore the same coat of arms ("Barry argent and azure"). By December 1349, John was Lord Steward of the Royal Household of King Edward III. He distinguished himself well in the Scotch and French wars. He was summoned to parliament often from 1338 to 1357, and is regarded as having become Baron Grey of Rotherfield. Note: Some sources describe him as 1st Baron Grey of Rotherfield, and some as the 2nd Baron Grey, numbering his father John de Grey as 1st Baron Grey (but not of Rotherfield); this can be confusing. He married firstly, shortly before 1313, Katherine Fitzalan, daughter and coheir of Bryan FitzAlan, Lord FitzAlan of Bedale, Yorkshire and had a single son and heir:   He married secondly Avice, daughter of John Marmion, Baron of Winteringham, a descendant of John of England. by whom he had the following issue:      John Morrison Oliver  John Morrison Oliver (September 6, 1828 – March 30, 1872) was a Union general during the American Civil War. He fought in many of the battles involving the Army of the Tennessee, occasionally commanding a brigade. He was born on September 6, 1828 in Penn Yan, New York. Oliver graduated from St. John's College in New York. He moved to Michigan and worked as a pharmacist. When the Civil War began he joined the 4th Michigan Volunteer Infantry Regiment as a private. He rose to captain in that regiment before being appointed colonel of the 15th Michigan on March 13, 1862. He led his regiment at Shiloh and commanded the 2nd Brigade, 6th Division during the siege and battle of Corinth. He returned to command the 15th Michigan during the siege of Vicksburg where he was part of the XVI Corps. He briefly commanded the 2nd Brigade, 4th Division, XV Corps and was transferred to Chattanooga in the wake of Ulysses Grant's victory there in 1863. Oliver was back in command of his regiment during William T. Sherman's preparations for the advance against Atlanta, but once the campaign got underway Oliver was in command of the 3rd Brigade, 4th Division, XV Corps.