And from Janasthana, that mighty Rakshasa monarch, the wicked Ravana, carried away his (Rama’s) queen by stratagem and force, deceiving, O sinless one, that foremost of men, through the agency of a Rakshasa, Maricha, who assumed the form of a deer marked with gem-like and golden spots.”

In plain words: Hanuman tells how the wicked demon king Ravana kidnapped Rama's wife Sita. He tricked Rama using the demon Maricha, who took the form of a beautiful golden spotted deer.