"The death of Józef Piłsudski" series of Polish stamps (1935). Sold as a strip of 5 stamps, full series of 5, 15, 25, 45gr and 1zł denomination. 
 
Józef Piłsudski was arguably the greatest statesman of inter-war Poland and its de-facto leader from 1926–35.
Interestingly he's been highly regarded by the Füher:
Hitler participated in memorial service organized in Berlin in 1935 (see the picture)
after conquering Poland in September 1939, Hitler paid a visit to Piłsudski's tomb
 
Piłsudski was very worried about the threat from Nazi Germany and did number of steps to keep them in check:
In 1933, after Hitler ascension to power, Piłsudski sent delegation to Paris to convince France to start preventative-war against Germany. The French did not agree. 
In May the same year Piłsudski's envoy met with Hitler and offered him a choice: accept existing borders with Poland, or face Polish invasion (!). Germany not being ready for a war yet chose peace (for whatever it was worth). 
On 26 January 1934, in order to put Polish concerns to rest, Germany proposed a 5-year non-aggression pact with Poland, which got signed. 
Piłsudski died on 12 May 1935. Poland was invaded 4 years and 3.5 months later.