eyck - The Ghent Altarpiece- St John the Baptist. 1425-1429. Oil on wood. 168.1 x 75.1 cm. Cathedral of St. Bavo, Ghent, Belgium eyck - The Ghent Altarpiece- St John the Baptist. 1425-1429. Oil on wood. 168.1 x 75.1 cm. Cathedral of St. Bavo, Ghent, Belgium