Baron Grey is one of the subsidiary titles of the Earl Grey, in the Peerage of the United Kingdom,
Baron Grey of Codnor is a much older and separate title, in the Peerage of England,
Baron Greystock is an abeyant title in the Peerage of England.
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The title of BaronGrey de Ruthyn (sometimes spelt Ruthin) was created in the Peerage of England by writ of summons in 1324 for Roger Grey, a son of John Grey, 2nd BaronGrey of Wilton.
Henry Grey, 7th BaronGrey de Ruthyn, 4th Earl of Kent (d.
Reginald Grey, 8th BaronGrey de Ruthyn, 5th Earl of Kent (d.