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From a canonical perspective, Shakyamuni is one of many Buddhas (i.e. humans who attained satori) and many lived before him, so the answer would be yes.
According to Therevada, each Kalpa has 1.000 Buddhas. Theravada lists some of these as "the named Buddhas":
In Mahayana, Amithaba was originally a monk called Dharmakāra in very ancient times (long before Shakyamuni).
From a historical research perspective, the Mahayana deities first appear in scriptures hundreds of years after Gautama's lifetime.