Polyxena and Troilus. To find out more about the princess of Troy, Polyxena, and her brother Troilus, see this Wikipedia article: link; for information about the image: image source.
King Priam of Troy and Queen Hecuba had many children; Troilus was their youngest son, and Polyxena was their youngest daughter. A prophecy stated that if Troilus reached the age of twenty, then the Greeks would not be able to defeat Troy in the war. Achilles, however, was able to ambush young Troilus and kill him. Still later, Achilles fell in love with Polyxena, a key factor in Achilles' own death - you can read about Achilles and Polyxena here and about the sacrifice of Polyxena here.
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