Brother of Anton de Kontski (1817–1899), Stanisław de Kontski (1820-1892) and Apollinaire de Kontski (1825–1879). Caveat: if a work you have is identified as being by "Ch. de Kontski" (or if the identification "Charles/Karol" comes from a later, interpolating editor, not from the first edition, which should be checked along with other sources, when possible) then consider Ch. does not necessarily mean Charles/Carl/Karol; as noted on his brother Anton's category page, the publisher (or other) might mean "Ch[evalier] de Kontski" - which = Anton de Kontski.
