Why is it an issue now?Greek Prime Minister Alexis Tsipras told parliament on Tuesday he had a duty to pursue reparations. He set the tone for his presidency early on by laying a wreath at a memorial to a massacre of Greeks by German soldiers in Athens.
But Greece's wartime enemy is now its major creditor.
Greek relations with Germany have deteriorated in recent years because of the financial crisis, with Germany one of the big contributors to the eurozone bailout that began in 2010.
The new leftist government argues austerity measures should be relaxed, a demand opposed by Germany. It negotiated a four-month extension to its €240bn (£170bn; $255bn) bailout last month after tense talks with creditors.
Continuar leyendo BBC
La compensación por daños de guerra que Grecia reclama a Alemania - Does Germany owe Greece wartime reparations money?