What was the mightiest reptile and the cave mans closest ancestor?

The mightiest reptile is often considered to be the Tyrannosaurus rex, a large carnivorous dinosaur known for its size, strength, and predatory skills during the late Cretaceous period. As for the closest ancestor of modern humans, or "cave men," that title typically goes to Homo heidelbergensis, which lived around 700,000 to 300,000 years ago and is believed to be a common ancestor of both Neanderthals and anatomically modern humans.