Cap Badge - Duke of Lancaster's Own Yeomanry This badge was sold by Jim Purdy for $20.00 on e-Bay in the Spring/Summer of 2017. This badge was deemed irrelevant to the museum. The money was used to purchase relevant badges for the collection. The Duke of Lancaster's Own Yeomanry has its origins in the various troops of light horse raised in the eighteenth century in the county of Lancaster, the earliest of which was the Bolton Light Horse formed in 1798. In June 1828 the Lancashire Corps of Yeomanry Cavalry assembled and by special act, the King, William IV, granted the title Duke of Lancaster’s Corps of Yeomanry Cavalry in 1834, and the Sovereign, as the Duke of Lancaster, has traditionally been Colonel-in-Chief.