ALCAZAR DE SAN JUAN or ALCAZAR, Spain, province of Ciudad Real, and an important railway junction, where the lines to the east and south-east diverge from the main line to Andalusia. Pop. (I g 20) 16,117. Alcazar trades in wine and manufactures soap, gunpowder, chocolate and inlaid dag gers. It is sometimes identified with the Roman Alce, captured by Tiberius Sempronius Gracchus in 18o B.C. It derives its name from its mediaeval Moorish castle (al-kasr), afterwards garrisoned by the knights of St. John. The entire district is associated with Cervantes and with the action of Don Quixote (El Toboso, I 2m. E.N.E. ; Argamasilla de Alba, 2 2m. S.E.) . Local antiquaries even identify the knight with Don Rodrigo de Pacheco, whose portrait adorns the parish church.