Portal:Poland/Did you know/18

... 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?