The constellation named after the dragon that guarded the golden apples is Draco.
Draco is the Latin word for “dragon,” and the constellation winds through the far northern sky. One classical identification names it Ladon, the dragon that guarded the golden apples in the Garden of the Hesperides. During Heracles’ eleventh labor, the hero was sent to obtain the apples; in versions where Heracles killed Ladon, Hera placed the dragon among the stars.
Draco was one of Ptolemy’s 48 constellations in the 2nd century and remains one of the 88 modern constellations. It circles the north celestial pole, making much of it circumpolar for northern observers. The constellation’s head is marked by several stars near Hercules.
Mythology is not completely uniform: other Greek accounts identify Draco as a dragon defeated by Athena during the Gigantomachy. The neighboring constellation Hercules is often shown with one foot resting on Draco’s head, reflecting the golden-apples story.