Szarlej () is a hamlet in Kuyavian-Pomeranian Voivodeship, Poland located in the Gmina Kruszwica, Inowrocław County. In March 2011, it was inhabited by 256 people.GUS: Ludność - struktura według ekonomicznych grup wieku. Stan w dniu 31.03.2011 r.
History In the 14th century, Szarlej was an important settlement in the Duchy of Gniewkowo.Władysław Biały. Ostatni Książę Kujawski by Józef Śliwiński. p. 30. In 1343, as the previous capital of the state, Gniewkowo, got burned down during the Polish–Teutonic War, Szarlej became the seat of the duke, and therefore, de facto capital of the state.
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