And Saul came to a city of Amalek, and laid wait in the valley. Saul came to a city of Amalek - I believe the original should be translated, and Saul came to the city Amalek; their capital being called by the name of their tribe.
Related Commentaries of 1 Samuel 15:5
1 Samuel 15:5
5 And Saul came to a city of Amalek, and laid wait in the valley.