Because it's the brightest object in the sky except for the Sun and Moon, Venus was known even in prehistoric times.
Venus rules love, relationships, cultural activities, art, luxury items, and beauty. Jewelry generally falls under her rulership. The importance of material possessions is associated with Venus.
The house placement of Venus in your chart indicates where you express beauty and peace. In the 4th house, you may decorate your house in a beautiful way. In the 12th house, you may value the peace and harmony of your privacy, keeping your desires a secret. In the 7th house, marriage partnerships may be a high priority.
The natal placement of Venus provides hints as to what you value and how you go about manifesting your desires. In the sign Taurus, you may own items that are high in value yet sensible. In Leo, you may prefer highly passionate relationships, or clothing that is royally luxurious.
Physically, Venus governs the throat, kidneys, and diabetes.
Venus' rotation is somewhat unusual in that it is both very slow (243 Earth days = 1 Venus day) and retrograde. In addition, the periods of Venus' rotation and of its orbit are synchronized such that it always presents the same face toward Earth when the two planets are at their closest approach. Whether this is a resonance effect or merely a coincidence is not known.