I want to know the answer to the following question:
This was the biggest display of mourning since the death of who?
All the background I'm provided with is that "The State Council declared a three-day period of national mourning for the quake victims starting from May 19, 2008; the PRC's National Flag and Regional Flags of Hong Kong and Macau Special Administrative Regions flown at half mast.". Is that enough to answer the question?