Who sold Winnie-the-Pooh to Disney?

Can you shed some light on the fascinating story behind the sale of Winnie-the-Pooh to Disney? Who was the original owner of this beloved character, and what motivated them to part with such a cherished creation? Was it a financial decision, or perhaps a strategic move to ensure the legacy of Pooh would be preserved for generations to come? I'm eager to understand the ins and outs of this historical transaction, and how it ultimately led to Winnie-the-Pooh becoming a beloved icon under the Disney umbrella.