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Royal Defiance were motorcycles produced from 1901 to 1904 by a family called Williams, at works established in 1880 in the Clanamman Valley, southwest Wales.
The first motorcycle was produced in 1901, and had a Belgian FN engine installed in a cycle frame with braced forks.
Following on came machines with 2hp, 2.25hp or 3.5hp Minerva engines. Because the works were so far away from a recognised industrial centre, the motorcycles would have been very primitive in design and construction.
The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X