Royal Crown Derby Company, Ltd. is a name used on porcelain beginning in 1890. There is a complex family tree that includes the Derby, Crown Derby, and Royal Crown Derby porcelains. The Royal Crown Derby mark includes the name and a crown. The crown was first used in the mark that appeared on Derby porcelain in 1775 after the permission of King George III. The words Made in England were used after 1921. The company became part of the Allied English Potteries Group in 1964 and has been bought and sold several times since then. Royal Crown Derby is still in existence. See also the Derby and Crown Derby categories.