The flag is a banner of the arms of Iestyn ap Gwrgant, the last Welsh ruler of Morgannwg, a kingdom that once covered the territory of the county of Glamorgan. The design, featuring three silver chevronels on a red field, has appeared extensively in the arms borne by various civic administrations in the county including Mid Glamorgan Council, South Glamorgan Council, West Glamorgan Council and the Vale of Glamorgan Council. Additionally it is a prominent charge in the city arms and flag of Cardiff. The proposed Glamorgan flag is promoted at the the following Facebook page http://www.facebook.com/GlamorganFlag . In 2013 the design was promoted as a potential flag for the county by the Glamorgan History Society (GHS) in cooperation with the Historic Counties Trust. Having secured support for the proposed design from several other local bodies from across the county, the GHS formally requested its registration as the county flag from the Flag Institute which was duly completed on September 24th 2013.