 By 1627 a small Union Jack was commonly flown in this position.One theory goes that for some years it would have been called just the "Jack", or "Jack flag", or the "King's Jack", but by 1674, while formally referred to as "His Majesty's Jack", it was commonly called the "Union Jack", and this was officially acknowledged.Amongst the proclamations issued by King George III at the time of the Union of 1801 was a proclamation concerning flags at sea, which repeatedly referred to "Ensigns, Flags, Jacks, and Pendants" and forbade merchant vessels from wearing "Our Jack, commonly called the Union Jack" nor any pendants or colours used by the King's ships.