Arlon ärlôNˈ [key], Du. Aarlen, town, capital of Luxembourg prov., SE Belgium, near the border with Luxembourg. Livestock and agricultural products are sold in Arlon, which is also a rail center. A small steel industry is there. A strategic point since Roman times, the town has suffered numerous attacks. Of note are Roman ruins, the Church of Saint-Donat (17th cent.), and the marketplace.

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