When was Manley Knoll created?

Please provide more context! "Manley Knoll" could refer to many different things, such as:

* A geographical feature: Is it a hill, a mountain, or a specific area of land?

* A building or structure: Is it a house, a park, or a monument?

* A historical event: Is it related to a battle, a discovery, or a founding date?

Once you provide more information, I can help you find the answer to your question about when Manley Knoll was created.