Nalanda Mahavihara is traditionally believed to have been founded under which Gupta ruler?

Nalanda’s foundation is traditionally associated with Kumaragupta I, often identified with Shakraditya in later accounts, although the institution expanded greatly under later rulers. This question belongs to the Gupta and post-Gupta phase, a period reconstructed through inscriptions, coins, monuments, literary works, scientific texts and accounts of foreign travellers. A reliable answer must connect the named ruler, author, work, institution, title or event with the correct chronology and source. The Gupta age is often described as a classical or golden age because of important achievements in Sanskrit literature, temple architecture, sculpture, astronomy and mathematics, but the label should not conceal regional diversity or social and political change.