Jagiellonian University, Poland’s oldest higher education institute (and one of the world’s oldest), was founded May 12, 1364 by King Casimir the Great.

Courtyard of Jagiellonian University
Part of Poland’s 1946 
International Bureau of Education set
Designed by Edmund Bartłomiejczyk

The other stamps are: School Children and Grzegorz Piramowicz (1735-1801). 

It began with 3 faculties, liberal arts, medicine and law and survived operated briefly under the name The Studium Generale. When Casimir died in 1370, the university closed. 30 years later, on July 26, 1400 King Vladislaus Jagiełło re-established Jagiellonian University.  

Following the failed attempts to restore it in the 1390s, the University was re-founded by King Vladislaus Jagiełło on 26 July 1400. Queen Jadwiga, who died in 1399, contributed to the restoration by leaving a considerable portion of her private estate to the University in her last will. The University’s structure was already complete in 1397, with the formal establishment of the faculty of theology. The oldest, main college was at first called the Royal Jagiellonian College (Collegium Regium), and then the Greater College (Collegium Maius). The University, located in the then capital of the Kingdom of Poland, never again interrupted its educational and scholarly activity. Not only does it constitute a symbol of continuity of the Polish state, but also places Kraków among the most important educational centres in the country.
Jagiellonian University 

Today the university includes 16 faculties, 3 medical faculties alone and 270 different programs. It’s home to 40,000 students from around the world, of which 65% are women. Take a look at Jagiellonian University ‘s alumni.It’ll give you a sense of how important the university has been to Poland’s development. 

Speaking of education:

Organic chemistry pioneer Justus von Liebig born May 12, 1803

1st Flight Over the North Pole