<P> and in King George III's proclamation of 1 January 1801 concerning the arms and flag of the United Kingdom of Great Britain and Ireland: </P> <P> And that the Union Flag shall be Azure, the Crosses Saltires of St. Andrew and St. Patrick Quarterly per Saltire, counterchanged Argent and Gules; the latter fimbriated of the Second, surmounted by the Cross of St. George of the Third, fimbriated as the Saltire:...</P> <P> When the first flag representing Britain was introduced on the proclamation of King James I in 1606, it became known simply as the "British flag" or the "flag of Britain". The royal proclamation gave no distinctive name to the new flag . The word "jack" was in use before 1600 to describe the maritime bow flag . 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 . </P> <P> 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 . Reinforcing the distinction the King's proclamation of the same day concerning the arms and flag of the United Kingdom (not colours at sea) called the new flag "the Union Flag". </P>

Why is it called the union jack flag
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