Who discovered Venus?

Answer 1

Venus has been known since antiquity, and was named by the early Sumerian and Babylonian astrologers. It was discovered to be moving long before recorded history.

After the Sun and Moon, Venus is the brightest object in the sky, rising shortly before the Sun or Setting soon afterward. Venus can be either a morning 'star' or an evening one, depending on its relative position.

So no one can claim to have discovered Venus. The first recorded record, was by the Greek philosopher Pythagoras who recognised that the morning and evening stars were the same thing is the sixth century BC.

See related link for more information.
Venus is visible to the naked eye and has therefore been seen and known about since ancient times. We therefore do not know who was the first human being to see it.
Venus has been known since ancient times and its discovery can therefore not be attributed to any one person.
The ancient civilizations called Venus the Morning Star when it rose in the morning and the same planet was also called the Evening Star, when it sets in the evening. This is because the ancient Egyptians thought the Morning Star and Evening Star were two different planets. Thus, Venus came to be known as the Wandering star. Venus moved in the sky from night to night and many times, one was unable to spot the object due to the sun's glare. The first person to understand that the two different stars, that is, Morning Star and Evening Star were one and the same was Pythagoras. Thus, you can answer who discovered Venus and when, as Pythagoras in 6th century BC. But Pythagoras made one mistake of thinking that the object revolved around Earth.
Venus was discovered, rather than invented. Venus is the third brightest object in the sky - after the sun and the moon, so it would have been seen in pre-historic times and the name of the discover is not recorded.