The various depictions of St. William Boy & Martyr in England and Europe.
Nuremberg - Bavaria Germany
The famous Nuremberg Chronicle, published in July 1493, contains a woodcut of the supposed martyrdom of William – crudely coloured at some point. The Chronicle also contains stories and depictions of other Christian saints and is one of the first printed books in Europe.
Nuremberg was one of the largest and most important cities under the Holy Roman Empire which ran from Charlemagne (8th Century) to the beginning of the 19th Century.
The cultural flowering of Nuremburg in the 15th & 16th Centuries made the city the centre of German Renaissance. The city was on the* main trade route from Italy to Northern Europe and this may be how the cult of William was spread.
Under the Nazi’s Nuremberg became famous for the party conventions – the rallies. The anti-Semitic Nuremburg Laws were passed in 1935 which revoked German citizenship for all Jews and it has been suggested that the “martyrdom” of William was used as propaganda in the implementation of these dreadful laws.
Frankfurt – Germany
According to some sources there was a depiction of William on the side of a medieval bridge in the City. Unfortunately most of Frankfurt was destroyed by Allied bombing in WW2 so this cannot be confirmed. Like Nuremberg the city was also on the main trade route and was likewise a major city under the Holy Roman Empire.
Ypres – Belgium
Ypres Cathedral contains a window dedicated to St. William – no further details at present.
*All the main trade routes in Europe in medieval times would be by water.
** Rood screen
“Rood” is derived from the Saxon meaning cross and is so called because it was surmounted by the Rood itself a large figure of the crucified Christ
All details above will need to be confimed , but it would seem that the cult of William was far more widespread than originally thought.