- ... that in 2005, composer Krzysztof Penderecki (pictured) added a ciaccona for strings to his Polish Requiem, begun in 1980?
- ... that by the Treaty of Vilnius (1561), Gotthard Kettler exchanged his office as Grand Master of the Livonian Order for that of a duke of Courland and Semigallia?
- ... that of the two competing Polish kings in 1705, one was allied with Russia and the other one with Sweden?
- ... that Elżbieta Sieniawska was one of the most powerful women in the Polish–Lithuanian Commonwealth during the reign of Augustus the Strong?