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Matteo Gladig (1880, Triest - 1915, Ljubljana) was an Italian chess master.
Born in Triest (then Austria-Hungary Empire), he won at Triest 1905 (torneo sociale della Società Scacchistica Triestina), took 2nd, behind Giovanni Martinolich, at Triest 1909 (campionato della SST), and drew a short match with Oldřich Duras (+1 -1 =2) at Triest 1909. He won, ahead of Stefano Rosselli del Turco and Arturo Reggio, at Rome 1911 (unofficial Italian Chess Championship, V Torneo dell'Unione Scacchistica Italiana).
During World War I, he - as an Austrian citizen of Italian origin - did not want to fight for an Austrian Army on the Italian Front. Finally, he was captured and tried in Laibach (Ljubljana, then Austria-Hungary) where he died.