Robert Marmion

Robert de Grey, called Robert Marmion, was the younger son of John de Grey, first Baron Grey of Rotherfield, by Avice Marmion. He married Lora, younger daughter and co-heiress of Sir Herbert St Quintin, and had by her one daughter, Elizabeth.

Robert died before November 1367, in his elder brother's lifetime. When his brother John Marmion died without children in 1387, Robert's daughter Elizabeth, by then the wife of Sir Henry FitzHugh, inherited the Marmion estates.