Vivian Mildred was born in 1884 and attended Guisborough Grammar School between June 1898 and December 1899.
He later served as a Squadron Quartermaster Sergeant in the Yorkshire Hussars Yeomanry during World War I.
Vivian, aged 34, was on board RMS Leinster when it was torpedoed and sank in the Irish Sea on 10 October 1918.
Vivian is commemorated on the Hollybrook Memorial which lists almost 1,900 servicemen and women whose graves are not known, many of whom were lost in transports or other vessels torpedoed or mined in home waters.
His name is also recorded on the Grammar School’s War Honours Board — alongside the names of all of the Grammar School’s alumni to die in the First and Second World Wars.