In 1980, Igor Carl Fabergé, a member of the family whose company launched the Fabergé Eggs, licensed a collection of crystal wine glasses in commemoration of the centenary of Pavlova’s birth.
Emperor Constantine established an annual holiday - Easter.
The Council of Nicaea established a single date for the entire Roman Empire to celebrate the feast of Christ's resurrection, the first Sunday after the first full moon of spring.
When the lyceum where Frederic's father worked was moved from the Saski Palace to the Kazimierzowski Palace, the Chopins settled in the outbuilding of the palace, the so-called post-rector's building.
Their neighbours were then: Juliusz Krzysztof Kolberg with his sons, Samuel Bogumił Linde and Kazimierz Brodziński.