The second son of John Lestrange and his wife Lucy, daughter of Robert of Tregoz, he was given land taken by Henry III of England from rebels in the Second Barons' War.
Due to his local knowledge of the Welsh Marches he was an important advisor to Edward I of England during his conquest of Wales.
On 11 December, he fought at the battle of Orewin Bridge, in which Llywelyn ap Gruffydd was killed - Lestrange wrote the letter informing Edward of his death.
On the death of his brother, Hamo le Strange, without issue in 1272 or 1273 Roger inherited Ellesmere, Shropshire and other lands.
[4] He served in the royal household as a knight for many years but he was already recorded as being sick in 1298 - Edward decreed in 1306 that he was so indebted to him for his service that he would attend his funeral.