Letters Patent by which King James 1st certified the granting of the Earldom of Bolingbroke to Oliver Lord St.John of Bletsoe. Oliver was head of the senior branch of the St.John family whose family seat was in Bletsoe in Bedfordshire.
The charter was made on 28th December 1624 and was gifted to the Borough of Thamesdown (Swindon) by The Friends of Lydiard Tregoz in c1984.