Some of the circumstances that caused Jove to agree that Calypso must release Ulysses are:
At the start of Book Five, Athena begs Zeus to intercede in Odysseus' perilous predicament, reminding him that Odysseus is being held captive by the nymph Calypso, while unscrupulous suitors threaten Telemachus' life.
There after the following message is relayed:
"Jove says that you are to let this man go at once, for it is decreed that he shall not perish here, far from his own people, but shall return to his house..."
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