Context : Raymond Rallier du Baty (30 August 1881 - 7 May 1978) was a French sailor and explorer, from Lorient in Brittany, who carried out surveys of the subantarctic Kerguelen Islands in the southern Indian Ocean in the early 20th century. 
Subject : Raymond Rallier du Baty 
Relation : date of death
When did Raymond Rallier du Baty die?