Lawrence Rowntree
Son of John Wilhelm, and grandson of Joseph Rowntree, Lawrence Rowntree was killed in action at the battle of Passchendaele in Novemebr 1917.
See further https://rowntreesociety.org.uk/rowntree-now/exhibitions-anniversary-events/lawrence-rowntree-exhibition/
The following piece about Lawrence was published in The Times, January 2019, following the acquisition of some of his surviving papers from the Rowntree family to the Borthwick Institute for Archives, University of York.
Lawrence Rowntree Times article