The nature of Caliban and Prospero's relationship looks very different according to whose perspective one adopts. From Prospero's point of view, he came to a wild island, which was until recently ruled by the foul witch, Sycorax. Prospero civilized the island and treated its inhabitants kindly, even Caliban who was
A freckled whelp hag-born—not honour'd with
A human shape.
Caliban repaid Prospero's kindness by attempting to rape Miranda, Prospero's daughter, since which time Prospero has kept Caliban as his slave.
Caliban would agree that he has been enslaved by Prospero, but apart from this, their relationship looks very different from his perspective:
This island's mine, by Sycorax my mother,
Which thou takest from me. When thou camest first,
Thou strokedst me and madest much of me, wouldst give me
Water with berries in't, and teach me how
To name the bigger light, and how the less,
That burn by day and night: and then I loved thee
And show'd thee all the qualities o' the isle ...
(The entire section contains 4 answers and 893 words.)