Who was King Priam's youngest son?

King Priam's youngest son was Astyanax. He was the son of Priam and his wife Hecuba, and he was the heir to the throne of Troy. Astyanax was a child during the Trojan War and is often depicted in myths and stories as a symbol of the tragic fate of Troy and its royal family. After the fall of Troy, he faced a grim fate at the hands of the Greek victors.