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Issac Newton's theroy was confirmed that there could be massive objects in space that light could not escape from.
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Albert Einstein's theory of general relativity helped him understand more about the univese and also black holes.
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Subrahmanyan Chandrasekhar was the first person to describe how stars can turn into black holes.
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Roy Kerr discovers that big stars will ‘drag’ the spacetime around them.
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Maarten Schmidt discovered a quasar, is one of the most powerful things in the universe.this helps him discover that it and all quasars are powered by black holes at the center of a galaxy. Quasar: An active Galactic Universe
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The name was given to these 'Unseen Darknesses' seen only on X-Rays, by an American astronomer by the name of John Wheeler.
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The first object to be reconized as a Black Hole suggestst to be founded as early as 1971.
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Nasa's Hubble Space Telescope and the Chandra X-ray observatory got strong evidence for the existence of an event horizon.
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http://imagine.gsfc.nasa.gov/ Other Black Hole timelines - bringing us to other sources.