Blizzard Entertainment owes a lot to co-founder Mike Morhaime’s grandmother.

During a pre-BlizzCon live stream on Wednesday, Morhaime revealed that his own grandmother Mildred Miller loaned him $15,000 to help get the company started. Even better, she let him pay her back with no interest.

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The letter that Morhaime received from his grandmother is now on display in the Blizzard Vault:

Morhaime said he and another one of Blizzard’s co-founders Allen Adham pitched in $10,000 each to get the company off the ground, and Morhaime’s $10,000 came from his grandma’s loan. …

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